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Make simple curtains to cover the front of wooden book cases. Use the long thin spring curtain rods attached to the inside of the top edge of the book case for hanging the curtains. You now have enclosed cupboards for storage.
You can also use hook and loop (velcro) tape to attach the fabric to the top of the shelving unit. I've also covered the front three sides of my portable cutting table with velcro and attached matching fabric. Under the table I've stored my current projects I'm working on in clear plastic storage boxes. It keeps my sewing room organized and looking neat.