Color Tool: DHTML/Ajax Site Matches, Applies Color Choices This is a pretty cool demonstration of what you can do nowadays with drag 'n drop, Ajax, and various other DHTML technologies. One part of the page slides out to let you select colors, which you can tweak to your heart's content with HSL sliders. The page shows a variety of complementary shades, which you can select in boxes below. Then, you can apply the colors to your "web page" in the background by dragging them to wells for background color, text color, box color, titles, etc.