I was recently talking with some folks in the merchandise department for the Steel City Derby Demons, Pittsburgh's kick-ass roller derby team. They mentioned they'd like to have another children's shirt to sell, something more boy-friendly than what they have now (their only current kids' offering says "FUTURE DERBY GIRL" on it, so that automatically excludes half the audience).
So I thought it over for a bit, and I came up with a design that I hope will fill their need.
I kept it to two colors to keep printing costs down. The black-and-gold combo reflects the SCDD team colors, plus it's reminiscent of the late-70s/early-80s "City of Champions" Steelers/Pirates t-shirts I used to wear as a little kid.
Just for fun, though, I also worked up a more elaborate 4-color version with crazier colors, just because I thought it would look cool: