With art collectors sunbathing and sightseeing, this is a great season to diversify your art portfolio on a shoe string.

Case on point: while Robert Romanoff, a New York art collector and heir to a beef company fortune, was away during the Thanksgiving weekend, somebody drilled a hole into his apartment in the Meatpacking District and stole his collection of Pop Art by Roy Lichtenstein (including “Thinking Nude” on the left) and Andy Warhol.