I've been tweaking around with pico-8 for around a week now, and it's reminded me many times of a game called Hammerwatch. One of the cool features it has is a quite good selection of graphical post processing effects simulating a CRT tv.
What I'm suggesting is to add similar effect, separately from the games, treating the pico-8 program kind of as an emulator. This way you could really get the old-school wibe going.

As for what effects I'm talking about, pictures speak better than words.

And before you go, I'll leave you with this.

I think this sort of "fluff" can be left for 1.0 or later - it's nice to have but nothing critically important. But it would be cool, yeah.

It is quite easy to make an effect like this, you could probably even make it as a CSS overlay to the canvas that displays the pico game. I have a demo of a CRT tv effect for the pico player working on my computer right now, I'll try to post a link soon.

Old thread... well I know you were probably hoping for something in Pico-8 itself but here is something outside

https://greggman.github.io/pico-8-post-processing/nano-villager_html/

This is so cool! Thanks for sharing!