...The posters on the hallowed walls of Jim Lapides's gallery aren't the kind destined for thumb tacks and dorm rooms. He's spent years combing through flea markets and estate sales, tracking down his impeccable collection of Bolshevik propaganda, classic ski art, Art Deco, and Art Nouveau advertising from around the globe. If you go, go prepared: Check the web site's invaluable searchable database for ideas.