After I finished the grid, it occurred to me how I could use a similar tool for my coding work: CFEclipse doesn't have a selectable color grid (most likely a limitation of Eclipse itself), and it's a pain to open up Dreamweaver or Fireworks just to get a color. So I decided to try and make my color grid into an AIR application.
The result is colorPicker, a widget-like AIR application that lets you either select a color from a grid of "web-safe" colors or design a color using sliders to change the red, green, and blue values of the color. Once you have the color you want, you can click on the corresponding "Save to Clipboard" button to copy the hex color code to the clipboard and then paste it into your HTML code in your IDE of choice. It also saves all of the colors you've copied to the clipboard during your session so you can repeat a color.
I've put up colorPicker here on RIAforge in the hopes that others will find it useful. Enjoy!