Homemade colourings

I came across this fantastic post on making homemade natural food colours.  They make great paints or can be added to playdoh or perhaps edible items that are complimentary in flavour to the items used to colour.

Update: Since this post I've found a couple more interesting and helpful articles on homemade natural colours:

Blue food colouring from red cabbage and baking soda

A fabulous selection of colours - red/purple, pink, yellow, brown

Purple from red cabbage, Red from dried hibiscus tea, Yellow from Tumeric and Green from japanese matcha green tea powder - a great link with photo instructions.

I once found an amazing post with all the colours of the rainbow and am desperately trying to find it again but not having much luck - I'll link it if I find it!