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I saw Maros's post about the line switches - but there's a way you can actually do this in a L&F friendly way (a customizer probably isn't the answer here): org.openide.awt.HtmlRenderer supports a small extension to the standard html color spec - you can refer to UIManager key-value pairs by prepending ! - i.e. <font color="!controlShadow"> means the UIManager color for controlShadow will be used. So simply define your UIManager keys and values in core/swing/plaf (Dafe or I can show you where) - and then if they need to be customized for a specific look and feel, they can, and look and feels like the Substance plugin can install whatever they want.