Mini- Colour by numbers

My first initial idea was to have a poster campaign colour by numbers. The idea was to have giant scale interactive posters and also flyers, where by the public could interact by colour in each numbered section to the corresponding colour or design their own mini, by choosing which ever colour they felt they wanted. This idea was to portray across the idea that there is an unlimited amount of different colour combinations one can have.

A rough design is below....

After looking back at this idea, I just didnt feel it had a good enough concept behind it so back to the drawing board I went.