Maria Von Cruchten's "Revalue" collection is a jewelry collection made of re-purposed grocery store coupons! I love both the diversity of how she used the coupons and the awesome patterns they create!
Jill Sylvia (on whom I cannot find more information...) cuts the cells out of ledger paper, making the paper into delicate lace. After hand-cutting the cells out of the grid, she uses the cells by gluing them down to a bigger piece of paper.