Maybe you just rejuvenated your home and now find the rest of your home look dated. There are many ways to refresh and enliven a room, and one effective ways, apart from a change of colors or furniture, would be to change those old window drapes. However, conventional is boring. Don't be afraid to introduce a little drama to the look by adding about 8" to the length of the curtains and let them fall over the floor.
Of course, the choice of materials would be the toughest decision in order to create that soft, flowing effect. A window treatment professional would be able to offer some help in that aspect though.