If you mean an actual gnome theme files, you can't do it (at least very easily). If you mean a KDE theme that looks like Clearlooks, a good place to look for themes is at kde-look.org
. There seems to be a couple different ones that come up when I did a search.
I don't know what's going on with the BlueCurve theme. Is it just that particular theme that doesn't work? One thought is to download the theme again and reinstall, maybe some file got messed up or deleted somehow?