I'm really starting to like spray paint. Krylon's Fusion line works on plastics and has a pretty neat selection of colors; I'm especially pleased with how the gradient turned-out. I tried to minimize and simplify the Sharpie work so it'll be easier to touch-up as the finer line-work fades. I gave my previous set of wheel covers to Big Matt after he trued my wheel following a little bang-up at polo a few weeks ago.
I still have 2 blank discs of corrugated plastic and a head full of corrugated ideas. I'm thinking some sort of crest or cost-of-arms for Ann Arbor bike polo. We shall see.