Hi James!
Yes, there are a lot of still pics. I have collected a huge (almost 400) number of them and set them for my screensaver. Did you find the moving ones? There are quite a few of them on youtube. One of my favorites (which is 2 hours long(!)) is:

It's one of my go-to activities when I really need to get out of my own head. Especially effective if you try to figure out what is going on in any given area of the screen (for instance, is it advancing or receding there). It requires so much focus (and changes sometimes faster than you can figure it out), that there isn't room for any other thought. 2 hours of that and my head's pretty well cleared out, lol. Can work even if not feeling able to focus simply because it is mesmerizing, even if one isn't trying to analyze it.

Check it out. I highly suspect it'll be right up your alley.