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
If you intend to print with cups
If you intend to print using cups, you should regard cups as a required dependency: If you build gtk+2 after cups, the cups printer queues will show up in gtk applications (once they have been defined, which might be quite a bit later in your build). If you build cups after gtk+2 you will only be able to "print to file".