Curtains complete a room and make it feel inviting. Pick a color fabric that compliments your bedding. If you used fabric on your closet, coordinate your curtains with them. This will give a unified feel and carry the color around the room.
Below you will see several different examples of window treatments. Curtain rods may be made from PVC pipe for only a few dollars (as seen in pictures 2-6). If your window is very large, PVC pipe makes it affordable to customize your curtains.
When working with cinderblock (as seen in pictures 2-3), run a 2×4 inch board up the wall to the desired height. Mount a rod bracket to the board and hang your curtain rod from that.