2px is an openbox theme with a 2 pixels border.
Please note that it is designed to be used with undecorated windows and I have no idea how it looks in decorated ones (very bad, probably).
In order to make it look right, please add the following in the section of your ~/.config/openbox/rc.xml:
WARNING: change ( and ) to < and >
2px fits quite nicely with my termGTK theme http://rent0n86.deviantart.com/art/termGTK-169819259
See 2px in action! http://rent0n86.deviantart.com/art/back-to-basics-169821524
Please comment if you like it or if you have any suggestion, and feel free to fav'it!