Cut earbuds from wires, right at the base of the earbud (where the wire goes into the earbud).
Open crimps wide using pliers.
Use pliers to shape crimps around earbuds.
Using super glue (or whatever type you have handy - the stronger the better) glue crimps to earbuds.
Insert earring hooks through holes in crimps, and viola! Two new earbud earrings. :D