Here's a great utility for Blogmeisters: ColorCache. You can link to the site from the Blogger Forum Downloads page.
This cool utility is free for non-commercial users (and a bargain at $30 for commercial users). It allows you to easily pick and choose colors, add colors to a custom palette, change the hue and saturation of colors, and so on. In other words, it's perfect for bloggers who want to change template colors and are tired of having to experiment, re-publish, and start over again trying to find that perfect color combination.
See a color on a site you like? Just use the color dropper to add the color to your palette. Want to find some complimentary colors for your selections? Just use the analogous and complimentary tool.
Thanks to Lockergnome for pointing this gem out.