What to do with a box of motherboards? Answered

I just went to a garage sale that I saw on craigslist. The guy advertised a good amount of computer stuff. Upon getting there I found a treasure trove of 3-8 year old computer parts. Long story short i bought a box of 20 motherboards for five bucks. Sadly only six of them have processors though. Now comes the problem, what the hell should i do with 20 motherboards? I'm actually gonna go back there too because he's got empty towers at $5 a piece, as well as NICs, video cards, power supplies, and the like. So again, any ideas on what I should do?