Here comes the fun part: choosing the style of your headboard. Though most people think of a wooden-style headboard, there are an astounding number of options out there for headboards. You can look for thick fabric headboards, leather headboards, and metal headboards. These also come in an array of colors that are sure to match the decor of your room! If you choose the classic wood headboard, you can find some well priced oak, walnut, and birch options.
The trick with a double bed is to simplify the entire look of the room (no clutter) and go with a more "reserved" look for the room. Keep the room as clean as possible; otherwise it may look as if the bed is lost at sea with your belongings! Another trick to give your double bed more of a profound appearance in the room is to invest in a good quality headboard. You may also want to consider finding a headboard with rounded edges to further compliment the simplified look.