Wallpaper—especially the old school, paste-it-up kind—can be both an investment and a time commitment. So if you’re putting in the money and the work, you might as well have fun with your wallpaper, right? We think so, and these Apartment Therapy readers did, too. Below, some of our favorite spaces covered in vibrant wallpaper.Is it possible to look at the girly wallpaper in this bathroom without smiling?