I'm working with a box of handed-down fabric scraps, mostly of medium size, from a neighbor who is downsizing. So far I have pieced together two different fabrics into a skirt, and have also made a fabric-covered folder and a bag for a set of little wooden toys. I also see several shirts coming out of this box, eventually. My long-term plan is to switch to button-down shirts made of woven fabrics; knits are harder to mend. I have a pattern I made years ago from a thrift-store shirt that fit well. That shirt had no labels and might have been homemade as well.
I've also experimented with covering small cardboard boxes with these fabrics. It's not something that I want to spend a lot of time on at this stage in my life, so I was looking for a fast method. I realized that I could cut wide slits into the sides of the box and just push the fabrics ends through, so they would be held by friction. If the fabric pieces are wrapped around the outside, and tucked through the slits from the inside, the box can look decent enough.
This reduces the strength of the box, but the advantage besides speed is that the fabric and box can easily be taken apart later and re-used or recycled.
I've also been deconstructing worn-out clothes into kitchen wipes as usual, and material for patching other clothes, and for other crafts. I experimented with weaving a side seam cut from a pair of blue jeans in and out of the holes of a small basket I don't like--it came out well.
I've done some Tightwad-Gazette-style "hourly wage" calculations. Higher-value pursuits include: washing Ziploc bags, mending clothes, cutting holey fabrics into wipes that take the place of paper towels, skipping or combining shopping trips, and decluttering to free up floor space.