If you're the sort of person who is easily fascinated by nature then you'll enjoy this National Geographic Extreme Earth Screensaver.
The screensaver contains a series of images the feature some of the most incredible landscapes and scenes from our planet. It covers extremes from the caves of Alaska, to the coves of Belize, and from Icelandic volcanoes to Antarctic ice flows. Be warned though, that these are mainly shots of rocks and landscapes rather than creatures, so animal fans may want to try a different screensaver.
The quality of the photography in the National Geographic Extreme Earth Screensaver is exceptional and the high resolution images really give you the impression that you're looking through a window onto this awesome world of ours.
On the downside, you have to put up with National Geographic branding on all of the images, and there is no options menu for customizing the screensaver.
On the whole though, the National Geographic Extreme Earth Screensaver will give your desktop a very eye-catching overhaul.