Our website provided a free download of desktopia 1.0 for Mac. This free software for Mac OS X was originally designed by Pierre Chatel. The software is included in Theming Tools.
From the developer:
desktopia is a customization concept that gives you the possibility to change your desktop picture based on a specified time of the day. The program is bundled with a specifically designed wallpaper-suite, but you could also add pictures taken by you at various times of the day.
You may want to check out more software for Mac, such as Live Wallpaper - Interactive 3D Galaxy: Galaxies, Stars and Nebulas in outer space, Canyons & Arches Desktops Lite - Quality desktop photos from photographer Richard Seldomridge or Colorado Desktops Lite - Quality desktop photos from photographer Richard Seldomridge, which might be similar to desktopia.