Folder Marker (System Utilities - Shell Tools)

This utility lets you change folder icon (mark folders) by priority (high, normal, low), level of project completeness (done, half-done, planned) and type of information stored in them (work, important, temp and private files). With Folder Marker folder icons can be changed ON THE FLY from the right-click menu of a folder. Simply right-click on the folder, select a color-coded icon and it will be assigned to the folder at once.