Some random BW examples:
"If I were a BW Dark Templar, i'd get into the girl's rooms, film them and make a lot of money selling videos over the internet"
"If I were a BW Arbiter, i'd use the Recall power to get all the money of the banks into my house and give a 'Project X' alike party'
"If i were a BW Medic, I'd restore all the illness out of sick people, and blind the bad guys"
We haven't had one of these for a while, so let's see how it goes.
Just for the fun of it, you can mix units as well.