
I could use an old, crumbling yoga mat if you have been thinking about replacing yours.
ETA: shelters and cat rescues find them useful too, so even though I've been offered several, speak up if you have one you've been meaning to get rid of! I can donate them the next time I foster bottle babies.
Pieces of yoga mat are useful for a variety of things! I have one in the kitchen drawer to help me open jars, one under my keyboard to keep it from sliding, another over it when I’m not using it, and several rubber banded to my wrist rests.
I’m about to rebuild my bookcases that have just been lying in pieces since I moved. They are salvaged lumber on glass blocks, and mat pieces help protect the floor and even out the irregularities in the wood so the weight is distributed more evenly across the blocks.