Realistic and beautiful live wallpaper of different cities with snowfall, moving clouds in different planes and colors that change dynamically during the day (full version).

Cities: Stockholm, New York, London, Toronto, Moscow, Paris, Prague, Seattle, Berlin, Kiev, Washington DC
Bonus: Seoraksan National Park, South Korea

Photo credits (flickr users)
Riddarholmen: gesternumdiesezeit
London: Karen Roe
Manhattan: Eva Abreu
Red Square & Saint Basil's Cathedral: Vyacheslav Argenberg
Seoraksan National Park: mendhak
Berlin: m.a.r.c.
Paris: Oh Paris
Seattle: Dave Morrow
Toronto: Blair Stirrett
Kiev: Andrew Bossi
Washington DC: Allie_Caulfield
Moon: Luis Argerich

OpenGL based.