I just got Williams, not Columbia. I graduated 3.23 from an Ivy, with a BA in art history. No publications, 2 years of research experience. One of the people interviewing said that this was the first year they did interviews, and they were interviewing all candidates (or maybe all candidates they were interested in). So far I've been rejected from all PhDs, but accepted to the Courtauld and Tufts for MA, and waiting on 2 more MAs (including Columbia).