I moved into my first New York City apartment almost three months ago, and bought a big, oak coffee table to complement the turn of the century architecture of my new space. And then I ran into a problem: The beige table, although beautiful, looked boring next to my white couch and ivory walls. Cue these Brazilian agate coasters. These little discs of color instantly brightened up my monochromatic living room, not to mention help to protect the table's surface from drips and spills.