So you need one instance of a component in your ADF application to have a different color. Your first instinct would be to just go to the style area in the property inspector and change it. Well, you might want to rethink this, a better way would be to define your style in a central location for easier future maintenance, and an even better way might be to use an ADF Skin for this. This way you have one location for your global skinning and specific styles.
Here is a demo of how to go about doing this.
Also in this demo a quick explanation of the difference between InlineStyle, ContentStyle and StyleClass.