Google says that it's "excited" to announce that twenty new iGoogle themes are being released today, focused on nature. They're collaborations with various organizations including the BBC, National Geographic and Ansel Adams Gallery.

The collection runs the gamut from the frozen Arctic north to the vast deserts of Africa and the seas of the Caribbean. There's also a collection of hand drawn bird images from the National Audubon Society.

If you'd like them on your iGoogle homepage, then just hit the link below, select a theme, and click "apply". Easy. Then, Google says, "get outside and celebrate the real thing".