With Valentine's Day just around the bend, I've been thinking a lot about Miss Cake's Ode to an Ex exhibit - a teeny tiny art show, featuring a dozen or so visual and literary artists, which opened on February 14th in Benson, Nebraska three years ago. It was, by far, the most inspiring and entertaining show I'd ever attended... filled with dark humor, somewhat homicidal (but harmless!) rage and unusual tributes to that which so many of us know so well: heartbreak. The collection's always…