Cold Stone Creamery is a major chain with tons of locations around Colorado.
These days the model is pretty standard: decent ice cream, get a big cold stone (perhaps a marble slab), mix in "stuff", sell at outrageous prices. Cold Stone's signature is that they will sing when you tip them.
Last week there was an article in the Denver Post about fair Cold Stone. Detailing their rise, sale in 2007, the frosty results in the economic downturns of 2008/2009/2010, and sharing some vague hope that "best October sales in four years".
I find Al Lewis to be capable of writing hundreds of words without actually saying anything. This article doesn't disappoint, closing with the riveting information that at some foreign stores the signature cold-stone sing for a tip schlock doesn't work and sometimes it does. Yay.