Those are 66 quart containers. I haven't had a lot of time to make corkboards, so I tried to find a quicker way to use up some of my cork supply. Alas, the cork trivet.
I used wood glue to attach the corks. Be careful to let it dry for a couple of days before you lean it against the wall, or the corks will slide.
They make great, personal birthday or hostess gifts! If you want to make one, and you need some corks, I have a few to spare. Someday, I'll make some more corkboards and tell you how I do it.