Ability to color or mark tabs

[ZPak]

I would like to be able to quickly identify which open files are related to each other. For example, I might color a service, facade, and DAO the same color to quickly identify it from another group that deals with different data. Additionally, if I am working on files with the same name (such as pages.xml) I know which ones are grouped together.

The easiest way I can think of doing this is coloring or adding some symbol to the tab used to select the open file.