I found this while nosing around other peoples apartments on Apartment Therapy. Do you remeber colouring in like this as a kid? Matching the numbers to the colours. Well, you can check out the finished result here.
I like the idea but maybe somthing more like this would suit. The pattern is from a vintage pattern book . Mmmm, all I need is an image, some graph paper, a colour chart and I'm on my way.