Some of SnowBall's best artists weren't even on stage. Among the young and the variably sober in the crowd on Saturday was a small group of artists, busily painting murals. They were situated between the two main stages, putting the eight-by-twelve feet wooden canvases at maximum visibility. The goal was to get exposure for some of Denver's best nonmusical artists. Judging by how frequently the painters were interrupted by kids wanting to discuss their work, that goal was achieved.