Based on the awesome job of WFH@lemm.ee documenting the stuff and applying it to solarized, I tried to do the same with my vim favorite theme: everforest. It's far from perfect (I'm not at all a designer), feel free to improve your way (and share updates in comments). The zinc theme is probably more refined because I use only this one, I tried to make slate match the palette but as I'm not using it it's more difficult.