Although I'm sure you already have plenty of master bedroom design ideas in mind, before you start decorating the room you must pay attention to the basics. By definition, the master bedroom is usually the largest one in the house but there are also other elements that capture the essence of the concept. All the bedroom design ideas you'll ever need. Find your style and create your dream bedroom scheme no matter what your budget, style or room size. If you have your heart set on a four-poster bed but don't want to overwhelm a small master bedroom: Dark, skinny wood offers a nice contrast against bright-white walls without consuming the space.