The thing I like about the wallpapers bundled in the Mac Operating System is that they are all soothing and actually very nice to look at. And the new ones bundled with the upcoming update to the famous OS X are no different.
Check them out:
My favorites are: Brittle Grass (last one), Lake (the one below the Lion picture) and Lion (self explanatory).
If you like the pictures, you can get them in full quality here.