An invitation arrived for me today with a memorable inscription: "Art is a timeless expression of a moment," George Rodrigue. And cookies were attached. The Blue Dog is everywhere these days. There was the big show at NOMA. Now media enticements. Rodrigue has produced a series of pieces on chrome paper that will be on display at the Sheraton New Orleans Hotel. It includes more several one-of-a-find Blue Dog Paintings. After the show, the artworks will be donated to metropolitan museums around the country.