I don't know whether this still is context-free, but i'll have it a try..
To make patterns more transparent, it might be useful to be able to cutout forms, so that f.i. a black square minus another, slightly smaller black square would leave a line-square with nothing inside. When i't done within a rule i think it's context-free..
The way I do this now is mostly putting a white square into a larger black one, but the result is of course not transparent.
The other, better way is to build transparent shapes from "lines", which is slower and less versatile.
Brightness-substraction would be a logical next step: black minus white would leave mid-grey.
shape cutout
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