I'VE NOW FINISHED. SEE THE 5TH POST.
I am in the process of making a transluscent Dragonoid from the Wal-Mart exclusive evolution pack light up via 2 red LEDs, a 47 ohm resistor, 2 watch batteries, some IDE wires, and some clever wiring that allows it to light up whenever it stands. I tested the circuit outside the bakugan and it worked, so I just have to slim it down enough to fit inside the cavity. I'm probably gonna need to take a dremel to it to make room enough for the batteries. Pictures to follow...