I know it doesn't really increase your value during development. It's just for fun but those of you that like it, here are some links that point to Nexus One skins that can be used on your local dev emulator.
Update: The Nexus S skin is available at here.
Installation is easy. Just extract it to
<android-sdk-install-root>/platforms/<your-platform>/skinsand then use it.
The result is pretty nice :)
What I forgot to mention. If you have problems with the size of the emulator that is going to be started, you may want to add a
-scaleto your emulator run arguments. In Eclipse you add it under your Run Configurations: