I had to create a clock for an auction benefiting students in industrial design. I only had to look on five different tables to get what I needed.
Step 1: Stuff
6 cleaned forks
6 cleaned soup spoons
Polystyrene sheet less than 5 mm of thickness
A clock mechanism
Gorilla or Super glue
Step 2: Clean
Once you've collected all the used spoons and forks, use a little bit of water and soap to remove any residue of food. The paint won't last on anything greasy.
Step 3: Core
Trace a circle on the polystyrene sheet and mark its center. Use a pair of compasses or a circular object. Your circle should have a diameter of 12 cm. Then use a cutter, scissors of a band saw to remove the excess plastic.