I really like this idea for an office or a library. Convert an old globe into a pendant light! Seems easy enough. Buy a lamp kit at your local hardware store, take apart a globe and drill a larger hole for the light. Put remainder of light together.
While I was searching for something else, I came across this Bird Cage Lamp at save-on-crafts.com -- a steal for $39. If you’re not into the whole decopauge/vintage-imagery thing, you could easily swap out or reface the included lamp shade. Perfect for a sun room, covered porch or bedroom.