Memory quilt from jeans & shirts. Notice that the denim pieces do not tough each other, so there are no super-thick seams or seam junctions to deal with, and the shirts reduce the overall weight of the quilt.
KA: Use this to make water dragon cave and other places from Chrono Cross? --- How to make rock caves and waterfalls using pink Styrofoam and hot glue! - Tanu's note: black rocks, neon green water and skeletons sitting on rocks