People like to find all types of things to build out of used corks. Problem is, they are not the best building material. This is probably the best I have seen, though where do you get yellow wine corks? Turns out even the French are switching to screw caps because 1) cork is a finite resource like helium, 2) it is just better at keeping wines from going bad and robbing liquor stores. Synthetic corks supposedly have their problems as well.