See if you can follow what is going on in this card trick video. Don't worry, the secrets are revealed at the end.
Upload a photograph and find out its average color as well as ten complimentary colors. This is a very useful tool for building a design based around any image, especially nice for website construction.
3. Color - Match
Photoshop has so much awesome stuff going on that it must be impossible for anyone to know about all of it. I wish I knew about this color match tool a long time ago. It basically forces one photograph to use the color palette of another. James Delaney of Unfocused Brain uses it to make his digital photos look like classical paintings.
4. Red Team
Use both hands to control two different characters. This game is difficult enough, but add in the violent red color scheme and it makes it hard to look at as well. I gave up after level four.
The first commercially available color films, Kodachrome and Exakta, were developed in the 1930s. However, French and Russian photographers were experimenting with color as early as 1872 with startling results.