I'm not sure about general dance, but there are a lot of wonderful ballet stamps.
There's a great ballet Bella. Stampabilities has a really nice set of ballet shoes en pointe - I just recently saw it on the Addictedtorubberstamps website. Also
http://www.allthatscraps.com/index.p...e82d0901574601
from lizzie anne designs
Good luck with the designs. I think making cards for a dance studio would be great! You can totally indulge your girlie side!