Finally getting around to posting this!
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In the summer of 2020 I was asked to create a 3-part "Intro to Substance Designer" workshop for New Media Manitoba's "Stay at Home Sessions." and started this material for the follow-along portions. Some time this year, I cracked it back open for a bit of polish and went full Ship of Theseus on it. It's still the same material, but only in spirit.
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There are parameters exposed to control the dirt level, flagstone shape, as well as density, size and amounts of weeds and/or flowers. After that I forced myself to stop.
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Created in Substance Designer. Rendered in Marmoset.