Modern Cave Paintings
I used honey and red clay to make paint, and I made two brushes – one out of a branch, pine needles, and grass; one out of a twig, goat hair (from live goats, haha), and grass.
THe paint was way more like regular store-bought than I thought it would be! However, my brushes fell apart while I used them -- apparently, grass isn't such a great binding material. Perhaps the cavepeople used their fingers more often than brushes? Food for thought.