Strewn across beaches, it's ugly as sin. Gathered up and presented on a billboard, it cleans up quite nicely. BBDO San Francisco this month constructed a billboard on Venice Beach made from almost 18,000 pieces of beach trash—as a teaser advertisement for One Beach, a film about beach conservation, sponsored by Barefoot Wine & Bubbly. The client has worked for more than 15 years to support clean and sustainable beaches—ones that are "barefoot friendly." One Beach, directed by Jason Baffa, looks at how creative innovators are cleaning beaches and changing the world. Check out footage of the trash billboard below. It's not a new idea—Saatchi & Saatchi made billboards from trash six years ago. But it's clearly an ongoing problem—and this is an intriguing way to address it. More images after the jump.