A truncated icosohedron made from .1" acrylic sheet.
Cut out the pattern on a laser cutter and assemble it. There are two layers in the bucky2 file, one for each color. The hexagon-hexagon connectors and hexagon-pentagon connectors are different angles, and cannot be interchanged. Having them done in different colors helps to keep them straight.
You should build the ball in two halves, and then put them together. Use acrylic glue to hold it together. The connectors can snap easily when you are trying to get those last few sides in, so cut a few extra :-)