I once created a color scheme for the "Color Schemes" preference module I too created long ago.
However, the Color Schemes module was deprecated (it still exists, but it is not installed by default) since we have the new Theme module and the Theme Engine in GNUstep. Themes have all the capabilities of the old Color schemes, plus of course new features.
Since I apparently had some faithful users of the old scheme, I took the effort to remake it as a Theme and also tweak some more details. It is already better than the old one. but other details can be tweaked and improved as a theme. However it is almost ready for a 0.1 release!
I hope the new theme will enjoy the same popularity that the old scheme had!
The appearance of GNUstep gets lighter, it looses much of the 3d accent. Somebody may call it more modern.