I don't know how many of you use Compiz as a standalone environment, but I thought this might be of some use. I copied a few files from Openbox, adjusted them accordingly for any possible Compiz or Compiz++ binaries, then packaged them up so they can be installed neatly. I mainly did this because it just felt odd to have a special ~/.xinitrc just to start up ob-autostart and compiz.
compiz-alone-session starts up compiz AND an autostart.sh, along with a few other things the openbox-session script does (which I've decided it should run off the copy in ~/.config/compiz if it is available).
compiz-alone.desktop is the session file for a Compiz standalone session. Whatever display manager that scans these session files should be able to find it.
The xdg-autostart script was directly copied from the Openbox package, mainly because it wasn't a separate package on Arch Linux. Not sure why, but I thought putting it in /usr/bin might be better.
The default autostart.sh isn't that much different from Openbox's, though I may change it for more aesthetic reasons.