One of the variants tends to give fractals a spinning / moving quality. Can't remember exactly which one it is now.
The wallpaper version is available at the preceding link.
Today's Gratitude Item: Having the Y12 dean magically appear in my class to check that everything was OK. We are still in the rather messy phase of getting our students into appropriate courses and some students who signed up for Computing should not be doing it as they don't have the equipment. Having the dean appear was really useful as he was able to take out the students that need to switch their options making everyone's life just that little bit easier.