Palette Man is a color palette-generation program that's geared toward web designers. You're allowed to select 5 colors from the 216-color web-safe palette and see how they interact. Colors are like words; just as context can alter the meaning of a word or phrase, surrounding colors can make a central color look different to the human eye. Experiment and see what effects the colors have on one another.
NOTE: If you've specified your own fonts to be displayed in your browser, this page will look pretty funky. Turn off user-defined fonts for a pretty presentation.