This effector allows you to change clones’ color. I actually built this effector just to practise creating and deleting User Data with Python. There is nice documentation in Cineversity’s Wiki how to handle this kind of stuff.
You can add as many custom colors as you want. Remove button will delete always the latest group.
I don’t know if it is a bug or what, but I coudn’t hide the group titles. But if you go to “Manage User Data …” and just press OK, group titles will be removed. I have to investigate that issue and update solution when I get this solved.