I did a quick internet search on +colorguard +latin +choreography, +colorguard +spanish +choreography, and +colorguard +carmen +choreography and got lots of hits. I figured someone must have done it. You might even be able to find a tape of it. I've been to a few drum & bugle corps competitions & I'm sure I've seen Spanishy stuff, certainly lots of dramatic numbers that might go with Carmen. Watch those tapes. You might also rent/borrow from the library ballet tapes of Carmen, of you just want dance moves. Think Tango, Paso, Flamenco. Even the "Lord of the Dance" Irish dance troupe had a flamenco dancer in one of the shows - maybe you can get your hands on that tape.

Good luck!