At least one person has tried, might have to search TNB

Tried in the sense of more than just "it'd be good to have this", but they actually started implementing

Found it: github.com/ETHproductions/Crayon

Very much unimplemented. :P

@DLosc But yeah, we've definitely considered making one several times. But so far I have no good ideas how such a language would best be structured. I also wonder whether it might be good to build them based on the 2D pattern matching languages (e.g. by extending them with substitution features).

I had the idea of inserting/replacing single characters for the 2D pattern matching languages, but the real challenge will be large-scale transformations, like rotations about a point, reflections or replacing contiguous blocks of a char type with some repeating pattern