Several iTunes 10 users were less than thrilled with the new all-grey UI theme. I've gotten used to it, but I agree it was a bit prettier with the color icons in the sidebar. Here's how you can replace the grey entirely with an eye-popping, high-contrast black and white.
First, quit iTunes. Then open up Terminal and enter the following:
defaults write com.apple.iTunes high-contrast-mode-enable -bool TRUE
Re-launch and pow! You'll be presented with the UI depicted above. It's definitely legible, and Macworld suggests that it looks best in List View. They also explain how to switch b