Using a hot glue gun, glue each cork to the other in a circular shape — then glue the ribbon of your choice to hold them all together and to serve as the finishing touch.
Also on these boards
Honeycomb Wine Cork Coasters with Khaki Ribbon -Set of Four - Housewarming Hostess Christmas Wedding Birthday Gift Home Decor
35 Easy DIY Gift Ideas That People Actually Want -- Custom photo coasters! So easy to make.
More wine cork ideas! DIY...these may cost $, and you'll likely spend more in wine making your own, but it will be FAR more fun than just shelling out $ for it!