Steal a pair of shoes from a Barbie when she's not looking. Alternatively, you could just buy a pack of doll shoes from your local toy shop.
Hold the shoe in place and carefully drill a hole through the heel of the shoe. If you don't have a drill at hand, you can hammer a nail through the shoe instead - but be careful, it's quite tricky.
Open a jump ring with some jewellery pliers and slip through the hole on the shoe.
Slip an earring hook on to the jump ring and close the jump ring.
Repeat with the other shoe and you've made yourself a cute pair of earrings.