Just dabbling in a bit of arts and crafts :) My daughter is turning two soon and we're celebrating with a rainbow party...this is how I found myself making rainbow crayons! Very easy...cut up wax crayons, put them into a flexible mould, melt in the oven, let cool, and you have a spectacular rainbow crayon!
My fan forced oven at 150°C, melted the crayons in about 10 minutes. I used a long thin mould for my crayons which gave a great effect, but they snap in half pretty easily. Next time it might be fun to make stars and heart shaped crayons!