Houston's signature waterway has been a murky mystery since before the Allen brothers followed it upstream and planted the future Space City on its banks. But at least back then its green-brown waters were clear of the flotsam and jetsam of modern civilization. Starting this summer, a vessel called The Mighty Tidy is aiming to rectify the situation. It cruises the bayou five days a week from Shepherd to the East Loop, scooping up tons of floating garbage. It's also equipped with attachments to pick trash off the bayou banks and out of overhanging trees. Credit its unusual colors to those zany Art Guys, Michael Galbreth and Jack Massing, who turned the quarter-million-dollar boat into a flamingo-pink nautical vacuum cleaner.