The abacus is about as old school as you can get, yet its nod to numbers and counting makes perfect sense for kids' room decor. Abacuses (abaci?) are fun for playing with and building motor dexterity, but we've been noticing parents using them as artwork.
Above are five examples of this mini-trend in action. (click through to see more of the room if you like). Several above were purchased at CB2 who no longer makes them, but Jenny of Anything Pretty figured out a way to make her own - check out her tutorial. Ellia's mom bought one on Etsy and had it painted to match the room, so there are all kinds of decorative possibilities.