Maybe a decade ago, I decided to start a theme from scratch, named bland. Initially, it was just black on white, with keywords bold, comments, macro invocations and lifetime tokens (this was all focusing on Rust) italic, and escape sequences bold italic. I decided to wait a week before deciding if I would add any colours at all. As expected, after that week I made strings red, comments green and numbers blue. Since then, I’ve made number type suffixes light blue, macro-related things orange, and delimiters grey (I should try dropping that one again). But things like making type, async, function*, for, const, of, &c. different? No, they’re all just bold black, no need to try distinguishing between them.

I also subsequently made a dark variant of it for my website’s dark mode and for occasions I want to use an editor in a dark place.

The colours involved are all high-contrast, using the RGB channels provided rather than trying to be silly with low contrast: #fff, #000, #c00, #090, #00c to begin with.

But I have no particular interest in publishing this in a form others can consume in whatever editors they use. Plenty of small tweaks that I develop over time, half for my own Vim syntax files. I think the approach itself, of experimenting deliberately yourself, is worthwhile.