fabric (maybe 12" square)
decorative paper (optional)
Flatten it all the way around.
Put your new face back into the clock. Make sure that center spindle thing is completely free of fabric. I took a razor blade and gently trimmed around it. Excess fabric will hang up your clock hands. Oh, and pay attention to which way is up on your clock when you replace the face (I referred to the hang tab on the back of the clock. Don't want to be 6 hours behind all the time!)
Put the hands back on your clock. (Little hand, big hand, second hand.) Then pop the top back on and you're finished!
After I got the hands on, I realized that the back looked kinda crummy, so I took it apart again, used that clock face template, and cut out a piced of scrapbook paper. There was enough glue left on the back to stick it down.