I've seen a model with these attached to the wingtips. Looks pretty cool! Only problem is they don't last too long and tend to scorch/melt covering. A couple layers of tinfoil seemed to protect the covering well enough.
Pyrotechnics, unfortunately, are a no-no with the AMA. Make sure when you do it everyone at the field is aware of what you are doing and O.K.s it. (Getting barred from a club is not a good thing!)

Jeff