I came across a great set of colour schemes called base16. From the website:
Base16 provides carefully chosen syntax highlighting and a default set of sixteen colors suitable for a wide range of applications. Base16 is both a color scheme and a template.
There are repos for the following tools:
- Base 16 Builder
- OSX Color Palette
- XFCE4 Terminal
- Gimp Palette
- Gnome Terminal
There’s even a builder so you can roll your own theme!
I’m currently using Monaki Dark 256 for iTerm2. The best bet is to git clone the iTerms 2 colour schemes to somewhere on your machine that is persistent. Perhaps _~/Documents/iterm2schemes/base16.
Then you can experiment with the colours you like by going to preferences->profiles->colors then import your schemes using the load presets dropdown (pointing to wherever you cloned the base16 repo).