Kids have enough of a challenge trying to keep their colouring inside of those lines, so why not throw them a bone when it comes to something like drawing a rainbow? Not only will these tongue-and-groove crayons never roll off a desk and shatter, they actually all connect together letting young artists draw a perfect rainbow, or any multi-coloured optical effect, in one motion.
A six-pack is just $US7 from Perpetual Kid, which of course means that 14 per cent of the necessary ROYGBIV colours needed to make a perfect rainbow are not included. But on the plus side, these aren't your run-of-the-mill wax crayons. They're actually made from plastic, so they're cleaner and produce smoother colours on paper. Although here's hoping they're still as easy to clean off walls. [NPW Gifts]