Got a chance to test your latest cmyk shader and it works perfectly Really captures the look of promo screenshots from video game magazines!
Using that bgrLUT you uploaded, I used Photoshop’s indexed color mode with a 64-color NES palette I found online and it worked beautifully:
So, while your shader obviously serves its intended purpose, it also has use as a general indexed color shader. All one needs to do is take the bgrLUT and convert it to their indexed palette using an *.act color palette file.
I tried your flickering scanlines shader, as well. It works great here, and it looks like it functions very similarly to the interlacing shader I wrote (misc/interlacing.cg in the common shaders repo)
That last blur shader looks nice and bloomy. Good luck getting it performant enough for general usage.