Something a bit different instead of the standard 21st key, a 21st crescent or adjustable spanner for those that like tinkering on vehicles.
Print out template on to paper and use spray adhesive to stick to some recycled wood.
Cut out on band saw.
Cut out on band saw.
Use bench hook to hold belt sander
Use bench hook to hold belt sander
Use rotary tool to get into the fine detail for sanding
Kind of looks like a crescent spanner.
Drill scaled hanging hole with forsner bit.
While we are at it, use round over bit in router and use rotary tool to add a little detail
Use wood burner to highlight the detail.