Lots of quilty plates up here in New Hampshire. Some I've seen: Quilts, Quilter, Quiltr, IQuilt, Quilt+.
Bit of trivia: New Hampshire has more vanity license plates per capita than any other state in the US. Reason: they are cheap and you "own" the plate for life (yes you pay to renew it every year, but the "name" is yours until you give it up).