I am trying to determine what is causing this problem. Whenever I play games like World of Warcraft, I get this fuzzyness in certain parts of my monitor where certain colors are. Darker colors like brown and blue get this fuzzyness. Earlier after this fuzzyness had been going on for about 8 minutes, i got terrible artifacts of all sorts all over making it impossible to use my laptop. Almost like if someone was wiggling my video card or something.
Hard to say till you post a pic, but more info on your system would help too- what computer, and what GPU? Could be your GPU overheating as just a first guess, but to have any real idea we need more info.