This is basically the Onyx theme that comes with openbox with a modified gtkrc-2.0 taken from somewhere on the web (sorry, don't remember where) with colors changed to an Arch look.
Install is simple just read the INSTALL.txt and modify conky and a few other files to your specs.
There's also a backup script so you can easily backup your openbox config after making changes.
Assumes you have rxvt-unicode and feh installed. xfce4-panel is optional (well, everything is optional, this openbox ;)