Old carpet appears to have a multitude of issues, not the least of which seems to be the decomposition of the jute backing leaving a lot of synthetic materials in your garden soil.
I like the idea of the clover walkways. Natural, no poisons or synthetics and easy.
I have recently re-roofed one of the buildings on my farm (there are 10 of them) and after getting through all the old asphalt shingles, I found two layers of cedar shakes which were really old and deteriorated. After getting all of them off the one section of the roof (10 x 64) of which there are 4 sections, I decided it would be a shame to just burn all that cedar. It is dry and very thin. So, I have begun to re-cycle it in several ways; of which the first is using it for mulch around the edges of the garden and for paths in the garden. It is biodegradable and natural.
While I do wonder if there are any "treatments" in cedar shakes, the effect has been remarkable. Running all those old shakes through the mulcher takes some time, but the rich, thick mulch appears to be just wonderful.
Anyone have any concerns about recycled cedar shakes, now would be a good time to tell me as I just put it down a little while ago.
I'm using a good bit of it as kindling for my wood burning stoves, too!
Best
Trim