Sweetness and Light
A modern visual gag in a retro advertising style that reveals the CFL bulb is the child of an old fashioned filament bulb and a swirl cone.
It's an innocent and happy design I think is perfect for the coveted Kid's tee print, but clever enough for guys and girls too.
It works on tons of bright tees, either in monochrome or in the design's true colors.
A suggested option is to use white glow ink if possible.