A small little scanline test I made out of boredom..
I know it isn't top-tier, or the most efficient, but I tried, atleast.
If you care a bit for how this was done, I basically set a couple FOR loops, get certain pixels' color, retrieve a certain value from a table, set a pixel with the recently retrieved value from that table at the position of the pixel that we retrieved its' color from, and, then, repeat that ~8192 times, and then you got some mediocre scanlines! :D
I get that was a bit vague, but if you want a more detailed explanation, just look inside the cartridge.
(passive aggressiveness not intended.)