Fireplace mantels are designed to frame the fireplace, and work the same way on your bed. The mantel headboard works best for smaller bed sizes because fireplaces often aren't that large. If you have a queen- or king-size bed, use the mantel shelf with new posts. Hang the posts on either side of the bed. Attach the mantel shelf above the bed on top of the posts. Make sure that the mantel is high enough that you won't hit your head on it.
Remove the glass from the window and cut cardboard or thin wood pieces the same size as the panes. Cover the pieces with different fabrics, using colors and patterns that match the rest of your bedroom, and place them in the window. Hang the window directly over the bed; if you have a larger bed, use two or three windows.
Select a color or pattern of fabric that matches your current bedding. Measure the size of your bed and cut a piece of wood that is long enough to reach across the bed's width. Make the wood piece as tall as you want your headboard. Cover the wood with quilt batting and then cover that with a large piece of fabric. Attach the fabric to the back of the headboard with glue or staples and hang above the bed.
A piece of wrought-iron or cast-iron fencing makes for a distinctive headboard. You also can opt for pieces of an old wood picket fence. For metal fences, sand down any sharp edges and apply a fresh layer of paint. Follow the same process with a wood fence or leave as-is, for a more distressed look. Attach the fencing behind the bed, using U-shaped hooks to firmly hold it on the wall.