I ADORE Funky polishes. Halloween editions, supernatural themed, you know odd names and tripping colors. No neons or pinks though...not really trying to relive the 80s (I lived them!) Suggest away!!
The Sally Hansen x Sour Patch Kids collabs had some funky colors. I got a bunch of them on clearance and they're fun to break out every once in a while.
I like finding weird shades of green, and some of those might qualify as "funky". Hare Polish "Pilgrimage to Pebble Beach" has a sage green with flecks of blue and gold and dries with an interesting texture. And China Glaze 1675 "Trash Can-Do Attitude" is a sort of metallic yellow-green that I found at the dollar store. I don't really like it on its own, but it's a fun base to play with for different toppers.