Colville had some success while still enrolled at Mount Allison, exhibiting at the Art Association of Montreal (now the Montreal Museum of Fine Arts) in 1941, and the Royal Canadian Academy of Arts in 1942. After the war, Colville returned to New Brunswick and became a faculty member with the Fine Arts Department at Mount Allison University. He taught there from 1946 to 1963. Colville developed his own style of Realism that influenced both a regional and national art community, as teacher and founder of the what would become known as Maritime Realism. By contrast to other members of the Maritime school, the composition of his work involved geometry. Often too, in his later work, he seized on the fugitive moment, imagining a hypothetical "What if" something happened in the conscious world.