diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java
new file mode 100644
index 00000000..bc078ac3
--- /dev/null
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import javax.swing.UIDefaults;
+import com.formdev.flatlaf.json.Json;
+import com.formdev.flatlaf.json.ParseException;
+
+/**
+ * @author Karl Tauber
+ */
+public class IntelliJTheme
+{
+	public final String name;
+	public final boolean dark;
+	public final String author;
+
+	private final Map<String, String> colors;
+	private final Map<String, Object> ui;
+	private final Map<String, Object> icons;
+
+	public static boolean install( InputStream in )
+		throws IOException, ParseException
+	{
+		try {
+		    return FlatLaf.install( createLaf( in ) );
+		} catch( Exception ex ) {
+		    System.err.println( "Failed to initialize look and feel" );
+		    ex.printStackTrace();
+		    return false;
+		}
+	}
+
+	public static FlatLaf createLaf( InputStream in )
+		throws IOException, ParseException
+	{
+		return createLaf( new IntelliJTheme( in ) );
+	}
+
+	public static FlatLaf createLaf( IntelliJTheme theme ) {
+		FlatLaf laf = theme.dark
+			? new DarkLaf( theme )
+			: new LightLaf( theme );
+		return laf;
+	}
+
+	@SuppressWarnings( "unchecked" )
+	public IntelliJTheme( InputStream in )
+		throws IOException, ParseException
+	{
+		Map<String, Object> json;
+	    try( Reader reader = new InputStreamReader( in, StandardCharsets.UTF_8 ) ) {
+	    		json = (Map<String, Object>) Json.parse( reader );
+		}
+
+	    name = (String) json.get( "name" );
+	    dark = Boolean.parseBoolean( (String) json.get( "dark" ) );
+	    author = (String) json.get( "author" );
+
+	    colors = (Map<String, String>) json.get( "colors" );
+	    ui = (Map<String, Object>) json.get( "ui" );
+	    icons = (Map<String, Object>) json.get( "icons" );
+	}
+
+	private void applyProperties( UIDefaults defaults ) {
+		Map<String, String> properties = convertToProperties();
+		applyProperties( properties, defaults );
+	}
+
+	private static void applyProperties( Map<String, String> properties, UIDefaults defaults ) {
+		// globals
+		ArrayList<Object> keys = Collections.list( defaults.keys() );
+		for( Map.Entry<String, String> e : properties.entrySet() ) {
+			String key = e.getKey();
+			if( !key.startsWith( "*." ) )
+				continue;
+
+			String tail = key.substring( 1 );
+			Object uiValue = UIDefaultsLoader.parseValue( key, e.getValue() );
+			for( Object k : keys ) {
+				if( k instanceof String && ((String)k).endsWith( tail ) )
+					defaults.put( k, uiValue );
+			}
+		}
+
+		// non-globals
+		for( Map.Entry<String, String> e : properties.entrySet() ) {
+			String key = e.getKey();
+			if( key.startsWith( "*." ) )
+				continue;
+
+			Object uiValue = UIDefaultsLoader.parseValue( key, e.getValue() );
+			defaults.put( key, uiValue );
+		}
+	}
+
+	private Map<String, String> convertToProperties() {
+		Map<String, String> properties = new LinkedHashMap<>();
+		if( ui == null )
+			return properties;
+
+		// convert json structure to properties map
+		for( Map.Entry<String, Object> e : ui.entrySet() )
+			addToProperties( e.getKey(), e.getValue(), properties );
+
+		return properties;
+	}
+
+	@SuppressWarnings( "unchecked" )
+	private void addToProperties( String key, Object value, Map<String, String> properties ) {
+		if( value instanceof Map ) {
+			for( Map.Entry<String, Object> e : ((Map<String, Object>)value).entrySet() )
+				addToProperties( key + '.' + e.getKey(), e.getValue(), properties );
+		} else {
+			String valueStr = value.toString();
+
+			// map colors
+			if( colors != null )
+				valueStr = colors.getOrDefault( valueStr, valueStr );
+
+			properties.put( key, valueStr );
+		}
+	}
+
+	//---- class LightLaf -----------------------------------------------------
+
+	public static class LightLaf
+		extends FlatIntelliJLaf
+	{
+		private final IntelliJTheme theme;
+
+		public LightLaf( IntelliJTheme theme ) {
+			this.theme = theme;
+		}
+
+		@Override
+		public String getName() {
+			return theme.name;
+		}
+
+		@Override
+		public String getDescription() {
+			return theme.name;
+		}
+
+		@Override
+		public UIDefaults getDefaults() {
+			UIDefaults defaults = super.getDefaults();
+			theme.applyProperties( defaults );
+			return defaults;
+		}
+	}
+
+	//---- class DarkLaf ------------------------------------------------------
+
+	public static class DarkLaf
+		extends FlatDarculaLaf
+	{
+		private final IntelliJTheme theme;
+
+		public DarkLaf( IntelliJTheme theme ) {
+			this.theme = theme;
+		}
+
+		@Override
+		public String getName() {
+			return theme.name;
+		}
+
+		@Override
+		public String getDescription() {
+			return theme.name;
+		}
+
+		@Override
+		public UIDefaults getDefaults() {
+			UIDefaults defaults = super.getDefaults();
+			theme.applyProperties( defaults );
+			return defaults;
+		}
+	}
+}
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
index e16e3ab8..acfc75d1 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
@@ -170,6 +170,10 @@ class UIDefaultsLoader
 
 	private enum ValueType { UNKNOWN, STRING, INTEGER, BORDER, ICON, INSETS, SIZE, COLOR, SCALEDNUMBER }
 
+	static Object parseValue( String key, String value ) {
+		return parseValue( key, value, v -> v );
+	}
+
 	private static Object parseValue( String key, String value, Function<String, String> resolver ) {
 		value = value.trim();
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/json/Json.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/json/Json.java
new file mode 100644
index 00000000..9a7b4b45
--- /dev/null
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/json/Json.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.json;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Karl Tauber
+ */
+public class Json
+{
+	public static Object parse( Reader reader )
+		throws IOException, ParseException
+	{
+		DefaultHandler handler = new DefaultHandler();
+		new JsonParser( handler ).parse( reader );
+		return handler.getValue();
+	}
+
+	//---- class DefaultHandler -----------------------------------------------
+
+	static class DefaultHandler
+		extends JsonHandler<List<Object>, Map<String, Object>>
+	{
+		private Object value;
+
+		@Override
+		public List<Object> startArray() {
+			return new ArrayList<>();
+		}
+
+		@Override
+		public Map<String, Object> startObject() {
+			return new LinkedHashMap<>();
+		}
+
+		@Override
+		public void endNull() {
+			value = "null";
+		}
+
+		@Override
+		public void endBoolean( boolean bool ) {
+			value = bool ? "true" : "false";
+		}
+
+		@Override
+		public void endString( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endNumber( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endArray( List<Object> array ) {
+			value = array;
+		}
+
+		@Override
+		public void endObject( Map<String, Object> object ) {
+			value = object;
+		}
+
+		@Override
+		public void endArrayValue( List<Object> array ) {
+			array.add( value );
+		}
+
+		@Override
+		public void endObjectValue( Map<String, Object> object, String name ) {
+			object.put( name, value );
+		}
+
+		Object getValue() {
+			return value;
+		}
+	}
+}