You can do so many cool things. I've seen vases used between the cake boards, filled with anything from flower petals, sea shells, glass marbles, etc.
I purchased one for a shower that I did last weekend that held 100 cupcakes...but in my travels of deciding rather to buy or make, I can across http://www.ellezdesigns.com they had instructions on how they made thier's if I recall..it held a couple hundred cupcakes. If you decde to buy...I received mine from greenpartgoods.com. They were great to work with :)