Let it snow - on your desktop! Snowland is a live wallpaper renderer, much like Wallpaper Engine. At the moment Snowland is still in early development. That being said, it is usable already!
The project is completely open source and can be found here on GitHub. Don't be afraid, the project is not dead, even though the main branch might suggest that. Development and planning is still going on and Snowland is currently undergoing a large rewrite.