Step 1: Materials

sugru
watch gears (I got mine off ebay)
a doorstop

Step 2: Fix Doorstop

Only if yours is broken to start with. Mine was.

Step 3: Sugru It Up

This took me 2 packets of sugru. You should do a prettier/better job of smoothing the sugru than I did.

Step 4: Make Patterns If You Want To

Rolling a gear through the sugru looked like fun, so I did it.
If you thought about it beforehand, though, you could actually press in a quite pretty design. Let me know if you do!

Step 5: Press on Gears

Pick a few that look good together, and just stick 'em on! Press in, but not enough to cover the gears with sugru.

Step 6: Hey Presto!

A day later, your stylish new doorstop is ready to use!