1. Cut your piece of cardboard in half.
2. Cut out two Christmas tree shapes. Try to make sure they are as similar as you can make them (trace around the first one you cut if you need to).
3. Paint the shapes green on one side.
4. Let the paint dry.
5. Paint the other sides. You may want to paint on some decorations at this stage too.
6. Create a slit up the middle of one of the trees, stopping halfway up.
7. Create a slit in the other tree shape, from the top downwards this time. Again, stop at the halfway point.
8. Use the slits you have created to slot the two pieces together. The tree should now stand by itself.