Follow this needle felting tutorial to create these fish. Use several colors within the cookie cutter and blend them together to make the fish multi-colored. No two fish will be the same which makes them interesting, especially if you make a set of them to hang as decoration.
Once the fish are finished, you can glue on the gems as eyes.
Tie on string for hanging.
This project is not recommended for kids. Extreme caution and concentration is suggested when needle felting, as it is too easy to jab a needle into your finger if you are not paying attention.