I have managed to convert this simple Vignette shader from Ogre to MV myself, so I thought sharing this with you guys.
Download Link:https://mvfps.codeplex.com/releases/view/105314Makes your scene more dramatic, lol. Lost the screenshots, just google "vignette effect games" or wiki it for those not familiar with it.
Installation:
1) Copy corresponding files to directories (ie. material, gpu programs)
2) Copy and paste content of vignetting.compositor file to Examples.compositor
3) Create a new compositor instance (python client code) or add this to WorldInit.py
I'm no shader expert, just got lucky with this one
Enjoy!