I made this a few months ago to see how well I could put LED's into a bionicle moc. It didn't turn out perfect by any means, but I say it was still somewhat successful. I am really happy with the moc itself, but I think that the wires could probably be hidden a bit more. I really enjoyed doing this, and I definitely want to do something similar to this again. Here it is!
Before it had LED's in it..
Here's him with all the LED's turned on. They're fairly bright, but I do say, they look a lot better in person. I also forgot to clip the hammer to the circuit so it lights up as well.
salvaged a battery box to use for him.