Acrylic Coaster for Desk, Clear Bar Drink Coaster, Clear Cloud Shape Coffee Cup Coaster, Perfect for Tabletop Protection and Accessories Display.

Very cool looking especially if there is even a fraction amount of light nearby. It looks like it's radioactive and glowing if there is! Unfortunately, due to this being acrylic, it scratches very easily (and badly) if you use a cup without a rubber bottom.