I've been experimenting with black-and-white syntax highlighting in difftastic. Comments are dim gray, keywords are bold. Here's a mock-up.
I'm trying to avoid garish colour combinations or distracting from the red/green of what's changed.
What do you think? Too subtle?
Incompatible Lego elements, and combinations that are avoided in Lego products:
https://bramlambrecht.com/tmp/jamieberard-brickstress-bf06.pdf