Consider these options for maintaining a fresh and clean home, car, office space, and so forth. We often overlook the fact that the exact items we use to make our home smell good, actually wreak of chemicals and toxins. The two links below list several alternatives to freshening up your space. Most of them are extremely simple, quick, and cheap!
http://greencleaning.about.com/od/DIYGreenCleaningRecipes/tp/Top-12-Green-Diy-Air-Fresheners.htm
http://www.homemadehomeideas.com/21-diy-natural-air-fresheners/