When looking into what goes into crayons, I was amazed at what I found, even those classed as non-toxic contained things such as paraffin wax!
Green Crayon makes a natural alternative and the ingredients are simple - soy wax, carnauba wax, cocoa butter, and natural occurring earth pigments.
 
This set includes
1 x mini beast crayon set (3 x crayons bugs and flowers, mix of styles)