I second the coloring! I have a gigantic stack of papers I've colored... After the first few weeks of "zombiness" I couldn't stand to sit around and do nothing.

Also, I have found that it helps to return to familiar books if you can read (or movies if you can stand to watch them). If I read an old favorite, it occupies my time without my having to think much since I've already read it before. I can also play a favorite movie on my computer and listen to it with the screen turned away so the visuals don't bother me.

Trying to read or watch something new is often too taxing for my brain. Besides, with my memory nowadays, the old stuff often seems new - just easier to understand.

I find the sound of water very relaxing. Rain is simply amazing.

Cognitive rest has been very difficult for me. Now that I can (finally!) read some and spend some time on my computer, I'm having to learn all sorts of new boundaries.