After having my mind blown upon trying out THIS (thanks for the link, Alyssa!) I decided my kids would have a ton of fun with it, too - using photos of themselves.
(And for those of you who don't want to click the link, but still want to know what's going on here - well, I'll tell ya)
Stare at the colored dots on Annelie's nose for 30 seconds. Then immediately look at a solid white sheet of paper/wall/ceiling/whatever and blink rapidly.
Yeah, how cool is that?
Wanna try it with photos of your own?
Well, if you don't have a photo editing software that will do it for you, you can download Photoscape for free (which is what I use when editing photos - just google it for the download link) and then play around like so:
Save, print, email to everyone you know, and enjoy!
And that's all, folks!
Have a great Wednesday!