Easily Change Folder Color In Bulk On Windows With Rainbow Folders. This program is free even for commercial use and doesn’t modify any system files or Registry.
Rainbow Folders is an easy to use program and a lightweight Windows freebie that lets you change the color of any folder icon on your computer, providing a very straightforward way to do this. You can use it to navigate your files more efficiently by setting specific colors for important folders, so they are easy to spot in Windows Explorer, open/save dialogs and anywhere else in the file system. In addition, you can also set an extra warning when someone is trying to delete colorized folder. Rainbow Folders works by modifying the Windows desktop.ini files and, once your folders are configured, there is no need to keep the program running unless you want to make changes to your folder colors.
You can colorize an unlimited number of folders – each into a different color. So you could, for example, color all important folders red, all frequently visited folders green etc. Also the effect of colorizing folders is not only visible in Explorer but in whole system, so also in any directory selection tree, and open/save dialog in any Windows application.