Flowers, flowers, flowers!
If you have a yard, go out and cut some flowers and put them in vase in a central area in your house. If you don't have any flowers growing in the yard, take a trip to the store and get some seeds. Flowers can make an incredible difference in your mood - reducing anxiety and stimulating your senses.
If you live in a condo or apartment, create a $3 budget per week for some flowers. Do this for one consecutive month and I promise you will experience the positive effect of flowers on your mood!