[wrp]

There was an MS-DOS tool by James Korenthal called Babble[0], which did something similar. It apparently worked according to a set of grammatical transformers rather than by generating n-grams, so it was more akin to the "cut-up" technique[1]. He reported that he got better output from smaller, more focused corpora. Its output was surprisingly interesting.

[0] https://archive.org/details/Babble_1020, https://vetusware.com/download/Babble%21%202.0/?id=11924

[1] https://en.wikipedia.org/wiki/Cut-up_technique