[Francis-134]

I don't know of a list such as this, but I would venture to guess that the combined brain-power of CD could probably tell you whether or not someone else is already using it.

On another topic, it's not that bad to use a theme that is already in use. For example, there are a large number of teams (even high-profile teams) who wear tie-dye, and there are a large number of teams who have common high school names/mascots (Bulldogs, Spatans, Chiefs etc).