All too often home makeovers require serious time and money. So we put together a room-by-room decorating punch list that can actually be accomplished within a weekend, for those of us that are short on time and even shorter on cash. Sometimes a few key items — or simple decorating moves — can really make a big difference. But if you want to sit this one out and just relax on your couch this Saturday and Sunday, well, that’s fine, too. Maybe you’ll come up with a brilliant quick change of your own to put into effect next weekend. Until then, here are some thoughts on refreshing a few of the main rooms in your home.