
Mike,
There is so much flagstone and granite in the Boulder area, the city government uses it for trail and park signs. So do churches (“Carved in Stone” must have biblical significance, I guess). City schools all have their stone signs, and a number of business and private individuals do, too. Many, if not most, stone signs have some kind of artistic design in addition to the words. I’ve singled out a small fraction (40 out of 1000s) that have some artistic flourish to them. Many have some deep significance I haven’t uncovered (like the Mason’s Time Capsule, to be opened in 2080).
A few signs are carved in Marble, which is soft and easy to cut, so it has been used for some intricate designs (The Time Capsule, and the Kingsridge sign). But acid rain (yes, Virginia, even the cerulean skies of Boulder do drip some acid rain) will do them in within a century or two. The flagstone and granite signs, however, will survive until the next 500-year flood in Boulder Canyon washes them out into Kansas.
Enjoy them while they last!
–rakkity