Hello, I'm sorry if this was already requested, I've searched a lot for it but found nothing. 

It would be awesome to have a few video CRT/DOT filters added to PICO-8 console. It's something I experiment in Fake-08 and it really changes the vibe of the game, it's like adding texture/details in bland colors. It could even be something games could activate/deactivate automatically. Here a few examples with  dot, scanlines, geom crt and off:

Dots (my favorite)

GEOM CRT

I personally think this kind of filter works particularly well with low pixel density content, like PICO-8. What do you think?

I love crt geom and dots man.

Love the idea!

me want

me require

Awesome idea!
Nowadays almost all emulators use shaders. Among them there should be PICO-8.

I think a shader-like feature inside pico8 would derail the main purpose of pico8.
Instead, I would prefer an external tool that can run pico8 cartridges and add shader behaviors.

[EDIT] Turns out someone already thought of my idea: https://github.com/greggman/pico-8-post-processing