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/105314
Makes your scene more dramatic, lol. Lost the screenshots, just google "vignette effect games" or wiki it for those not familiar with it.
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