Doodling is fun and can be done on almost everything. Everyone can doodle; there are no rules for how it should look. You can draw directly on eggs with Sharpie pens. You can colour designs if you like, but remember not to get too close to the black outline, which could cause it to smudge. Black eggs are easy to make with spray paint. Let dry and then colour with a thin, white Posca pen, which doesn't dry as quickly as the Sharpie pens. Be careful not to touch just-painted designs.