The BoingBoing-noted launch of a Google image search feature makes finding images sorted by Create Commons license much easier.
Useful, too: found this nineteenth-century picture of old First Universalist, Minneapolis, which looks like the spitting image of (still) First Universalist, Providence. Who knew? Makes me wonder if there was a relationship or influence, like through its ministers or through Tufts. (One of Tufts's presidents of the period was a former minister at Providence.)