just an idea that popped in my head out of boredom, seemed interesting to try to conquer the mat room again :)

how to make a "censor blur" material to put on say a a square prop and get the effect?
i know lf 2 kinds, 1 is a plain "blur", 2nd is a patch of say 16x16 pixels that just averages out what it blocks(basicly lowering the resolution of the one patch of picture), so how to do both kinds?

obviously both would use refraction, if one wishes to go for detail, especially in animations
but what else would be needed to get the effects? thoughts?