GTK+2
You may want to download http://www.muhri.net/nav.php3?node=gts to switch between gtk themes after installing themes/theme engines as is described in http://art.gnome.org/faq.php you can get themes and theme engines from the same site
Installing into DESTDIR
If you make DESTDIR=$SOME_DIR install, be aware that the $SOME_DIR/etc/gtk-2.0 directory and the gdk-pixbuf.loaders file in that directory will not get created. To correct that, after you've installed GTK+2 to its final destination, as root use mkdir (or install) to create the /etc/gtk-2.0 directory and then run:
gdk-pixbuf-query-loaders > /etc/gtk-2.0/gdk-pixbuf.loaders
