I mix and match designer flat sheets to make sets. I make one big block and it is done in a jiffy. As I get busier, my blocks get bigger, but it's quick and easy to redo a bed you just need a main material than use another color or two of another sheet. Sheets save a lot more money than buying by the yard. You can find nice sheets at discount places like outlets and thrift shops.
I get my new sheets about 6 bucks and used for less.