well first of all you have to know how to set it all up yourself.
i bet debian wiki can help with that (install a graphical environment, maybe)
or
arch wiki (install X server?).
maybe even ubuntu wiki.
maybe there's already a thread about something like this (yes, based on ubuntu) either on
crunchbang forums or on
bunsenlabs forums.
slightly simplified, just installing openbox will pull in tons of dependencies, maybe even a display manager, and with a little luck it will "Just Work".
then you can still install all the bunsenlabs stuff & scripts, they maintain packages & a github repos.