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 <applications> section of your ~/.config/openbox/rc.xml:
2px fits quite nicely with my termGTK theme.
See 2px in action!
Please comment if you like it or if you have any suggestion, and feel free to fav'it!