I like the collab idea propsed by skarabee; but I thought I'd put in my two cents for an alternative methodology.
My problem is, I tend to get stuck once I work out a "beat/pattern." I mean once I have a rack of instruments that sound good together in a one/two/four/ or 8 bar loop I tend to get bored and give up on trying to turn it into an entire composition/track/song/ whatever.
So I offer this as an example of 5 machines all with only one pattern.
I think I would be happy to work on other people's stuff with a (nearly) full instrument rack and and some degree of interlocking melodic/chord/rhymthic structure to play off of, if that makes any sense.... or similarly I'd love if some some genius could take one of my basic ideas and expand upon it.