A new year offers plenty of time and maybe some fresh motivation to whip your surroundings into shape. But which projects give the most bang for your buck? We’ve got 20 for you to consider. Some are pricey, some are cheap, some involve shiny new smart devices, and others are as low-tech as they come. Many are perfect for do-it-yourselfers. All will help put cash back in your pocket in the long run.