You mightn't have a clue what a resistor or a capacitor does, but if you can find one in some old gear or pick some up at an electronics store, you can adapt them into fairly geeky jewellery.
Craftzine offers a book excerpt from Kilobyte Couture (as a PDF download) that offers a step-by-step guide to turning electronic leftovers into jewellery. If you're feeling less subtle, both come in plenty of other colours. For another DIY jewellery project, check out how to make your own jewellery cleaner. Thanks Gail!
Radial Raindrop Earrings [Craftzine.com]