I remember having such a nice discovery of "glitch art" when I was writing my own quantization algorithm (discrete cosine transform [and inverse]) and I had a bug but got nice looking outputs, like this one:
https://i.imgur.com/LMjg40v.png
Not sure I remember what the bug was (probably some overflow/clipping issues when dealing with 8 bit numbers) but the original image (above) was unprocessed frame from a movie (I don't remember which one).
Once the bug was fixed, there was little difference (except for the blocking effect of quantization). Was quite surprised how such a small bug creates such drastic visual difference.
