If you’re in Washington, DC, this Christmas, take a good, hard look at the tree decorating Capitol Hill. This year, hanging next to the traditional bells and snowflakes, you’ll see plastic turtles, fish, and jellyfish. The brainchild of artist Bonnie Dillard, these unusual decorations are made from marine debris—plastic that had washed up on the beach where she lives on Kodiak Island, Alaska.