A small collection of Gtk+2.0 themes

Download and then install the .pet file (installs into /usr/share/themes)
Select the new theme using Menu - Desktop - Change appearance - Theme

In some cases (Crunchy & Elegance), a GTK2 theme may also contain the corresponding Openbox window theme
- this will be shown by "combined" in the pet name

If loaded themes are not shown as available in the configuration utility then it may be that you need to install the engine.pet