UPDATE: light blue doesn't show up as inactive hilite color anymore
Custom Color Themes based on the Bluecurve Controls
REQUIRES: bluecurve engine
INSTALL: copy into either your /usr/share/themes or /opt/gnome/share/themes dir or your ~/.themes
if it doesn't work then you probably don't have the bluecurve engine installed so make you have it.
and naturally this is released under GPL
screenshot in action: [link]