Not truly a custom but rather a mod, I took a Funko POP Big Daddy and gave it a light-up feature. You can do this too by using a hairdryer and heating up the helmet rack and prying it off, then prying the front helmet off the same way. Inside is hollow so I drilled out the eyes, used googly-eye caps for the porthole lenses, then filled them with clear epoxy. The led light kit came from one of the floating pool lights and turns seven different colors, but stays on whatever color you choose. This was perfect for Big Daddy's 'moods'.