What you'll need:
- bright nailpolish, I used 4 different colours
- wooden oval, mine was 5 centimeters. I got it from this shop
- brooch pin
- hobby glue
- black marker, in the picture is a sharpie, but that one didn't really work as well as I hoped, so I used another one.
Paint, I also painted the sides. Each colour was applied three times.
Paint some more, I left one part uncoloured
Glue the brooch pin to the back
Make patterns with your marker. I finished it with a layer of varnish.