Was just in a wedding for my buddy. He gave out personalized mini whiskey barrels, to age your own whiskey. Thing is awesome. I have engraved shot glass from a wedding two years ago that I have not touched since. The Whiskey Barrel I just got and already aging my first batch.
http://www.etsy.com/listing/94178325/engraved-2-liter-mini-whiskey-barrel-for
Not sure if this is where he got them, but it is just like this. Every month in the little barrel = year in large barrel.