All I have is Maya 8.5 unlimited and Gimp to work with. I also have Autodesk combusion 4 which came with my Maya but I've never used it before. Sounds like I need to read the manual and find out eh? I've never done any compositing before and I just learned how to render in layers a week ago.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!