Your sheets have aged or may have been torn and you intend to throw them away. On the other hand, you are sorry because they have a nice design or colors. There is no need to throw them away, as they may be useful elsewhere.
Here's what you can do with your old sheets
Tablecloth
If color and fabric allow, you can use the sewing machine to cut them, sew them and make a nice tablecloth for the kitchen.
Kitchen towels
However, you can cut them and make kitchen towels.
Legs
But you can also make an apron with your old sheet.