How to use leftover scrap upholstery fabric?

wallets, small handbags, purses, belts, lap top covers

You could sew together and use for small pillow. Sew in half, if large enough. Stuff with a little cotton and a few herbs like cinnamon, cloves, etc and use for sachets. Use as backing for small pictures. If sewn in star, diamond, or other small shape they can be used for tree decorations, or key chains.

I've made banners with mine. https://www.exquisitelyunremarkable.com/2017/01/box-pleat-scrap-fabric-garland.html

Depending upon how big the scraps are, you can make pillows, table runners, mantle scarf, wall hanging, coasters. Options are endless.