Just about anyone who feeds round bales to their stock is familiar with baling twine. It's true that some people use netting to wrap their bales, but I have a deep dislike for that stuff - it freezes to the ground in the winter, as well as to the bale, and it always seems to shred rather than peel off nicely. Luckily for me, the people I get my hay from feel the same way, and they use plain old orange baling twine.
Now, plain old orange baling twine has it's challenges too - you do need a knife to cut it (you can't break it with your hands), sometimes it gets rather embedded in the hay of the bale and it's hard to pull it off, and it will eventually shred into frayed bits if pieces of it are left out for too long. Everyone gets into the habit of picking up any pieces that are lying around - animals can get it caught around their feet, and some will even eat it, although I have no idea why it would seem appetizing.
Still, it is useful stuff. You can use it to tie a gate shut, fasten the ends of rolls of fencing wire so they don't unroll, even weave a patch for a hole in the fence.
This week, though, I discovered you can knit with the stuff. It seemed to me that this fairly stiff plastic twine would make good raw material for a boot mat. So, I cast on 75 stitches on some 6.5 mm needles, and off I went in garter stitch. I haven't got very much completed yet, but it is working out just as I had envisioned. I found some comments online from people who have had similar ideas, so it's not exactly a novel thought ... but, it seems to be working.
I'll post a picture when it's done.