If you've decided you can take a gift back without breaking the giver's heart, do so. Don't do it tomorrow, unless you're a glutton for punishment. Wait a day or two, and if at all possible, go to the mall when it first opens. Actually get there before it opens. Take the newspaper, read it in your car and wait for that employee with the dark circles under his eyes to open the door.
Some people are eager to say good riddance to an unwanted gift and to the season in general.
Personally, I love the season so much I go through withdrawal starting tomorrow. All those decorations that were so much fun to put up are not nearly as much fun to take down. The house looks bare and dull after all those little twinkling white lights and shiny ribbons are back in storage. It's a good idea to stay up as late as possible tonight, because in the morning Christmas is over. Of course, holiday 2001 will be here before we get everything put away from this year.