Building bookshelves from scratch or welding metal might be out of your skill set, but it doesn't take too much crafty skill to make some bedroom decor yourself.
The simplest way to add some panache to your bedroom is with a fresh set of curtains. You can make curtains from thrift store linens or store-bought fabric and use Stitch Witchery, an iron-on permanent fabric adhesive, to hem -- no sewing required! You can find Stitch Witchery at most fabric stores.
For more adept seamstresses, try whipping up a runner for the end of the bed. Choose a fabric that you love, cut it to 25 to 30 inches (63.5 to 76.2 centimeters) wide and the length of your bed, plus about two feet, then hem it using blanket binding in a coordinating or contrasting color.
New sheets can change the whole tone of your room, but they can also be expensive. Instead of dropping a bundle on a new set, try freshening up your existing sheets by dyeing them with fabric dye.
Another fun accent that you can sew yourself is a set of simple, custom throw pillows to give your bedroom character and a pop of color on the cheap. To make a very simple pillow, cut two rectangles of fabric to any size you like, then iron and pin them wrong sides together. Sew around the edge of the fabric, leaving a 1/8-inch (3.2 millimeter) seam, and a 3-inch (7.6 centimeter) opening, so that you can flip your pillow right-side out again. Once it's flipped, stuff it with polyfill, then hand sew that opening closed.
After you've sewn your accent pieces, you can whip yourself up a customized headboard to add a focal point for the room.