Utilizing the same countertop material used for you islands, you can have your fabricator miter (45 degree joint along its length) the edge of the counter, and go vertically to the ground.
This is a stunning look that adds height to the countertop material, allowing you to show off the color/veining from across the room.
Costs: expect same cost per square foot, with the added costs for labor and the miter joint (which can be several hundred dollars per miter).