Like Stereograms?

[Menard]

You know those pictures that look like some kind of confetti kaleidoscope that you stare at until you see a 3D image?

Here's a collection of 154 such images:

http://david-pye.com/index.php?page=stereograms


Don't go blind.

[Patient7]

They're fun, but I'm not good at seeing the image.