A few weeks ago I made a yeast starter from some oak cubes that I received from a fellow homebrewer. They were innoculated with a buffet of bugs from different lambics and such. I poured all of the liquid from the starter into my lambic and then poured the chips into a fresh erlinmyer with some fresh wort to make another starter and I am getting this really cool pellicle growth going on. It is like powdery little snowbanks scattered about on the surface of the wort. Pretty cool, at least if you are geeky like I am.