DC Metrocentric and others wrote in about the new billboard erected by artist Yoko Ono at 6th and K Streets NW. Yoko’s no stranger to the District Of. In 2007, the artist participated in Street Scenes: Projects for D.C. at several different venues. Yoko imagined peace at the Verizon Center, planted ten wish trees around town, and delivered a (shall we say) interesting lecture in Anacostia. Yoko’s Ex It was recently featured as a…