Ok, quick little life hack, you only need like three things: some regular old, worn-down pencils (it can't be sharp), your trusty old a mortar and pestle, and then you go to the fridge and grab whatever berries there are in the fridge. Crush up the berries to a nice, fine pulp and then coat your pencils each with the seperate colors. Of course, cherry and bluberries are staples for a nice, rich, deep red and purple, but you might have trouble finding yellow (Its fine though, nobody cares about yellow). This is actually what the ancient cave people started out on and look what they did: https://imgur.com/a/OcF8E4F Absolutely exquisite.