YoutubeColor is a free extension for youtube.com. It allows you to customize the color scheme of Youtube in a really quick and easy way. If you're searching for the best and easiest way to customize your Youtube experience, then this is it.

You can use it with Google's Chrome browser, so even if you don't have it installed on your browser, you can still use it.

Just click on the palette icon in the top right-hand corner to display a pop-up window where you can change the color scheme of Youtube to "Default", "Dark" or a custom theme, once one has been made.