Clean your windows. You'd be amazed what a good window washing can do for your house, to say nothing of the way you feel. Mix a cup of vinegar with a gallon of warm water and spray down your windows, inside and out. Wipe them off with old newspapers. If you can't stand the smell of vinegar, toss some lemon verbena or lemon balm in the mixture.
If you have curtains, take them down and launder them. Throw a bit of dried herb, such as sage or rosemary, into a cloth baggie and add them to the rinse cycle.
If your windows have mini-blinds, dust them and wipe them down. If it's warm enough outside, take them outdoors and spray them with your garden hose. Let them dry completely before hanging them back in.
While you're cleaning the windows, do your mirrors too, using the same mixture as above. As you see your reflection in the mirror, visualize cleaning away negative energy from your life.