First of all, you will need to decide which style of interior decorating suits your aesthetics the best. Are you all for a touch of the Mediterranean or do you prefer the Victorian elegance? Is your room more about functionality than design elements? Answering all these questions will help you decide on the perfect design for your headboard.
You cannot have a picket fence as a headboard if your room's theme is oriental, as it would be a complete mismatch. If you do not have a specific theme, then the task of choosing from different ideas becomes much easier. You could pick from a variety of options, from mirrors to paintings, and even doors.
If functionality plays an important role in every bedroom furniture that you have picked, then extend this to the headboard as well. Use headboard designs that serve multiple utilities at once.
Another factor that will play an important role while choosing headboard for a king size bed is your budget. If you have vast amounts of money at your disposal, then you can choose from the best stores and hire the best decorators to help you with your task.
But in case budgeting is important, then you can scour garage sales and second-hand stores. Haunt auctions, and chances are you will find a headboard that you absolutely adore. Also, a tight budget will force you to think out-of-the-box and come up with unique designs.
Alternate between tiny round mirrors and square mirrors. Do remember to frame these mirrors before putting them up behind the bed. If you are making your own headboard, then this is one of the best and simplest ideas.
Upholstered headboards have been around for quite a while now, but you could also tweak the idea around a bit. This will have to be done when the room is being designed in its entirety.
This is one of the best ideas to opt for in case you own an antique fireplace mantel. If not, then look at garage sales and antique showrooms, and you are sure to find one. Get a mantel in a wood finish and install it behind your bed.
This is an idea that works very well for a Victorian-themed bedroom. This is also one of the best do-it-yourself ideas, as it is very easy to install the fireplace mantel on your own.
An idea that works very well for an Oriental-themed bedroom is to color the room white and install tiny lights on the headboard. Now place bamboo plants behind the bed. This looks very aesthetically pleasing.
These are just some of the ideas that you can opt for. Give a free rein to your creativity and you are sure to come up with many ideas for headboards that you can use to completely change the look of your bedroom.