GameBoy-like Old-School 2D Filter – By TwisterGE
Here is an 2DFilter (to be used in the Blender Game Engine) in wich you can achieve a interesting GameBoy style. Look at the picture below:
You can found the original post by TwisterGE in Blenderartist.
Grab the 2DFilter files here:
If you are a newcomer in the Blender Game Engine and don’t know how to add a 2dfilter, look at this post to see a video tutorial about it.
Also I recommend you to read more in the official blender manual here.