I was looking for a new color scheme for my terminal, and while browsing through the many available color schemes, I found this post to quickly preview iTerm2 themes without having to import them first. Hope it helps.

In case you need help filtering through that long list of colors, I went through them all and shortlisted these:

Andromeda.itermcolors
Arthur.itermcolors
Atom.itermcolors
Breeze.itermcolors
Chalk.itermcolors
ChallengerDeep.itermcolors
Dark+.itermcolors
Darkside.itermcolors
Fideloper.itermcolors
Hacktober.itermcolors
JetBrains\ Darcula.itermcolors
midnight-in-mojave.itermcolors
Mirage.itermcolors
NightLion\ v2.itermcolors
Obsidian.itermcolors
OceanicMaterial.itermcolors
Subliminal.itermcolors
Tinacious\ Design\ (Dark).itermcolors
Tomorrow\ Night\ Eighties.itermcolors
UltraViolent.itermcolors
Under\ The\ Sea.itermcolors
Unikitty.itermcolors
Urple.itermcolors
Wombat.itermcolors
Wryan.itermcolors
Zenburn.itermcolors
ayu.itermcolors
deep.itermcolors

Though I haven’t settled on a single one yet.