The South Florida artists known as the Highwaymen, who originally took up painting as a way to pick up a few extra dollars and perhaps find a way out of their poverty-stricken lives in the orange groves, are enjoying an unexpected renaissance. The artists, who focused almost exclusively on Florida landscapes as their subject matter, began painting in the late 1950s, and have turned out an astonishing volume of work over the years. Initially sold for $25-$30 apiece, a painting by one of the original Highwaymen can now sell for upwards of $10,000.