MINNEAPOLIS - Lynne Robertson is famous. At a time when many advertising agencies have consolidated, she bucked the trend when she purchased the Minneapolis retail agency Fame, which she had been leading, from its owner, the Omnicom Group holding company. A year later, Robertson said she has no regrets as she remakes the firm. She expanded its client base and recently relocated to a new office. The 20-person agency added 11 clients this past year, including retailers, restaurants and health care businesses. "I'm really delighted that we have been able to continue to attract good business and that we continued to build our talent pool," she said. "I didn't think we wouldn't, but you never know. You step off that precipice, and it's a leap of faith."