I just set out some 1.020 wort in a mason jar covered with cheesecloth for a few hours, and let them ride. After a few days, I stepped up the ones that didn't smell like death, and ended up with 1 that smelled like something I'd like to use.
I ended up with what seemed like a good strain...I'll know more this weekend--I made a simple blonde with it to see if I could figure out what I've really got. Initial tastes (at bottling) are nice--seems like a nice Belgian-y or hefe-y type of strain.