I was reading this new article on Synthetica and NetBeans RCP this morning, when I remembered this screenshot from Henry Arousell from Sweden:

Here, Nimbus is heavily being used, highlighting 6 areas where Henry would really benefit from any help regarding how the foreground properties should be set:

1. The color of the main menu (and its subsequent unfolded menu options)
2. The TopComponent tab colors (as you can see from the screenshot, they've managed to change the foreground colors of the ones in the editor mode by setting the Nimbus property "TextText"). They cannot manipulate TopComponents in other modes, though.
3. Table header foreground colors
4. The foreground color of any provided composite component, like a JFileChooser or the ICEPdf viewer or any other panel with label components.
5. The progress bar message color.
6. The status bar message color,

A Nimbus expert is needed to help here, though it seems to me that some of the solutions have already been identified, or are similar, in the article pointed out above.