I think this should really be in the Gigs and Collaborations section of the Forum.
However, have also you considered doing this yourselves? If all you want is static LEDs, there are pre-made strings of them that all you'd have to do is wire them up to a switch, current limiting resistor, and battery. Even if you want something more involved, like a programmed sequence or some kind of interactivity that's not very hard to do with an Arduino. Although you might want one that's intended for wearable projects like the LilyPad.