Thanks for the quick answer, indeed, after removing /root..gtkrc-2.0 I can finally choose another Theme. But I have to say: yours was the best already
Maybe I'll hunt down later on for another theme if I feel like doing so.
I was wondering if KDE needed that file, so I logged (after removing it) back into KDE RC2 and all my settings where lost. The shortcuts I made in the menu, the desktop backgrounds, .... So maybe for users who wish to use both, the'd better think twice. For me, as a new Gnome user, it doesn't bother me that much. But thanks again, for the effort!
Oh, have you seen the log out problem now, with RC2 and Gnome?