Hypnos ever-changing mandala images are great to watch while listening to hypnosis tracks or for eyes-open meditation.
For more unstructured meditation, Hypno has its own mesmerizing sound effects.
I liked the images so much that I added a method to pause and capture an image to save to your photo album. Hypno also allows you to tweet your favorite images via twitpic.com, and automatically hashtag them so you can share them with your friends.