Boxotronic Technology: leftovers of the awesomely powerful Elders, Cardboard Boxes can be nearly anything... As long as it is ridiculously awe-inspiringly powerful!
The Atomic Cerebral Enhance-O-Tron resembles a cardboard box, turned upside-down, but with three strings attached to it which are used for input, output, and grounding; the grounding string functions like a lightning rod for brainstorms so the user can keep ideas "grounded in reality". The strings are tied to a device resembling a metal colander, which is worn on the head. When used, the wearer of the cap receives a boost in intelligence, and his head becomes enlarged. The intelligence boost, however, is temporary. When it wears off, the subject's head reverts to its normal size.
Sprite wise, I have a nice animated cardboard box and in the spirit of it all being the SAME box in grownup terms, so it shall be. With a few objects added here and there. ;)