Help with creating a custom 2D filter

OK,

I am extremely new to python coding in the game engine. All I want to do is make the scene, (Or what the camera views) more orange, like its in a dust storm. I would use the sepia filter, but that just converts everything to black and white and then adds a slightly orange pass over the top.

I just want everything to appear more orange…? Is there a way to code in a low opacity image into the 2D filter, or what?

I did a small video tutorial on basic GLSL in the BGE: http://www.youtube.com/watch?v=qNM0k522R7o

Maybe it will help you?