Don't Go Alone by pgil 2011-05-02T21:35:00
I just draw the entire screen to a surface, then draw it three times each frame. The first time I draw it normal, without interpolation. The next three times I draw them with additive blending and interpolation on, one colored red, one green, and one blue, each one offset one pixel from each other. I also cycle it so their positions and alpha values are slightly different every other frame. The scanlines and darkened borders are just a single image drawn on top of everything.