They are, in their rough way, stunningly beautiful. Three boarded-up houses at Casino Center Boulevard and Hoover Avenue (kitty-corner to the Newport Lofts) are covered in exquisite, fine-lined graffiti, down to their last square inch. (Someone even painted the rocks around the houses.) Originally curated by a crew that included street artists Vyal, Man One, Dytch, Tiki J, 7 Seas, King 157, Black TCB, Aceix and Vegas Seven 2014 Intriguing Person Ras One, the structures speak colorful volumes about our hardscrabble Arts District. These houses are hard to miss, though you soon might: A sign promises a shipping-container shopping plaza will soon occupy the spot. See them while you can.