CHICAGO — A suburban Chicago man pleaded guilty Tuesday to swindling at least 250 people out of more than $1 million through the sale of counterfeit prints advertised as the work of Pablo Picasso and other major contemporary artists. Michael Zabrin of Northbrook admitted sometimes paying between $1,000 and $1,500 for counterfeit limited edition fine art prints produced in Spain and Italy and reselling them on eBay for many times that amount. In his signed plea agreement with prosecutors, 57-year-old Zabrin said he would send away to his Italian source for fake Picassos, saying: "I need some P's." When he needed bogus works by Roy Lichtenstein, he would say: "I need some L's." In the summer of 2004, Zabrin purchased eight counterfeit works purportedly by Marc Chagall for $20,000 "which he resold at no less than three times his cost," according to the plea agreement which was presented to Judge Robert M.