This tool allows you a few variations of your existing colours used on your site for slight variations. Great for working out what you might want to use in a gradient. Visit Link
Tag: colour
color.hailpixel.com ยท Swatch you doing?
A great colour picker too. Move the cursor up and down for brightness, left and right for hue and scroll up and down for saturations. Clicking on the screen saves the current colour and opens another column for you to choose a new one. Visit Link