This piece by Virginia Fleck is made from post-consumer aluminum can tabs.
She notes that, "I was at a scrap-yard, seven months pregnant, perusing scrap metal, when I came upon a treasure-chest- sized bin overflowing with gleaming silver aluminum tabs. The sight of these tabs, separated from the cans, sparkling in the bright sunlight was like a mirage among the rusted scrap. I was overcome by their unexpected beauty and traded the few dollars crumpled in the pocket of my maternity dress for a bucket of sparkly tabs."
I am in awe.