UNITED COLORS: On Tuesday night, Moschino hosted a cocktail party at its Meatpacking District boutique to celebrate Ross Bleckner’s appointment as the goodwill ambassador for the United Nations Office on Drugs and Crime. The painter is the first fine artist to hold such a distinction, and it’s already taken him far away from the rarefied gallery world with a trip to a refugee camp in Uganda’s Gulu region. “I took art supplies, and we just tried talking to these children, who are the victims of atrocity, to help them access their feelings about their situation and their lives,” explained Bleckner of his work with 13- to 19-year-olds of the war-torn region. “The goal is to have these children have some self-esteem and, as a result, a lot of them have expressed the desire to go back to school.” The program, which will be replicated in other camps, will be feted with a May 12 benefit and art sale called “Welcome to Gulu,” marking Bleckner’s official appointment at the United Nations. A big-name committee will host, including Agnes Gund, Calvin Klein, Alec Baldwin, Eli Broad, Rachel Weisz, Jeff Koons, Natalie Portman and Sandra Bernhard. And despite the serious nature of the UN’s work, even Bleckner admitted his lofty title was earning him a bit of teasing. “My friends are already kidding me about it,” he admitted. “But I don’t commit crimes, and I don’t take drugs, so I’m clean.”