Easy DIY colour toys

I know from pinterest I'm not the only crafty nerd who gets excited and inspired by paint cards from hardware stores. I think it's Taubman's that come in this nifty circular shape with a slit to the centre. 

Slip a bunch together and you have an adjustable rainbow wheel.

I used an idea from pinterest to make this matching game:

I've also been working on tangrams... stay tuned!