1 wallpaper in the day, then one at night?

[Noted]

How can I make it so that say for example 6am-6pm I have a day wallpaper, then after it automatically changes to a different wallpaper from 6pm-6am.

Is this possible because I'm sure I've seen it done before.

 

[mkrishnan]

It's a cute idea. And here's a solution:

http://www.versiontracker.com/dyn/moreinfo/macosx/30670