Every now and then I come across something on our wonderful worldwide web I just have to share.
Just in: National Geographic's
Infinite Photograph project (thanks, Snyder)
The Bread Art Project.
Snyder found the
Color Scheme Designer v.3
"This is a great resource for artists or just for decorating. It's a very very cool tool. Just to give you an idea of how detailed it is, there is an option called "Simulate color vision deficiency" -- it shows you how people with, for example, protanopy [1% of men] see the colors. Very cool."

http://colorschemedesigner.com
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Here's another one:
Play with this: www.wordle.net
Wordle is a toy for generating "word clouds" from text, blog URLs or Feeds that you provide. In this example, I linked the RSS feed of the "recent activity" on DocuTunes...

Wordle: DocuTunes on March 26
copyright:
http://www.wordle.net
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Play with this: idée multicolr search lab
It's simple: You pick up to ten colors, and the
idée multicolr search lab pulls small squares from ten million "interesting" pictures on Flickr.

I tried with gray scale and shades of red and pink... The multicolr search lab is synonymous with everything I LOVE about the internet… and now I can color this love in all shades of pink! Or green, or blue... On top of the addictive fun, this is a cool tool to try out color combos.
There's more at idée labs... check it out:
labs.ideeinc.com
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More toys mentioned in the below comments:
www.shapecollage.com, a utility software (all platforms) to create photo collages; added by
Thaw.
www.jamstudio.com, an online music factory to create simple loops by just clicking a few buttons; added by
Snyder.