The Off The Air plates feature the same test pattern you would see when you were up too late watching TV back in the day. Funny how an annoying test pattern screen can seem nostalgic.
Coincidentally, these plates are made out of the same cheap material as the plates you ate off of during the heyday of analogue TV. Somebody find me a first generation Nintendo, I need to blow the dust off my game. Anyway, check out more of the Off The Air plates at the link below.