How do we refinish an ugly canning storage closet in our basement?

We have an unfinshed, poured concrete wall basement that has two canning pantries built in. The pantries are about 4' square, concrete walls, with homemade wooden shelves. There is no ceiling, just the basement rafters, and it's full of cobwebs and concrete dust. We'd like to finish the closets to use for linen storage and other odds and ends. Any thoughts about how to install a ceiling and make the walls nicer? Thanks!
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