If this idea interests you, I suggest using very simple, straight-lined clocks and also using the same clocks if this will go in an office. If you want to have it in a living room or a fun room you could use clocks from the parts of the world or clocks that have the style of that area. This clock that I featured is a atomic clock that is available from http://www.zocalo-imports-furniture.com but there are many very good looking clocks at places like target that will do for this project!
I have been to about 10 different Caribous and while they all maintain a Northwoods, Lodge style decor they all have something unique and equally inviting to all of them. And due to their consistency I would have to rank Caribou as the more stylish of the two biggest coffee chains.