Microsoft currently offers four custom Xbox 360 Faceplates.

The Xbox 360 faceplates are called Silver, Woody, Flame and Hot Rod. The names are pretty self-explanatory. Amazon.com is already shipping the Silver, Flame and the Woody in two days. The Hot Rod Xbox 360 faceplate ships on the Xbox 360 launch day (November 22nd).

The Xbox 360 Faceplates sell for $19.99 on Amazon.com.
I could not find Xbox 360 faceplates from other companies. I wonder if Microsoft is going to license faceplates to other manufacturers. If you have seen other Xbox 360 faceplates please email me.

The E3 2005 Xbox 360 faceplate was the first custom faceplate available for the Xbox 360. Microsoft will also give-away a Xbox 360 Zero Hour faceplate at the Xbox 360 Launch event.