A while ago
Abstract Wallpaper in Pixelmator
Following our series of Pixelmator tutorials, this week we will show you how to create an abstract wallpaper using the Quartz Composer filters. Even though the effect seems a bit complex, you will be surprise how easy is to create it in Pixelmator. It won’t take you more than 10 minutes to reproduce this tutorial.
Fábio Sasso, Abduzeedo