Wallcat - Enjoy a new, beautiful wallpaper, every day.
Pattern Monster - Pattern Monster is a pattern maker app to create vector patterns for your projects
Splashify - Beautiful desktop wallpapers for Mac and Windows
Patterninja - Create patterns online
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
Patternizer - Create awesome background patterns in just a few minutes