Then in the hall bathroom.
Often times on the dining room table. Lucky for me we have a Trader Joe's near our house. They always have an amazing assortment of flowers and I was able to buy three bunches of tulips and one bunch of iris for less than $20. In the summer, I can also go to our local farmer's market and get flowers rather inexpensively.
If you are feeling a little down, go get yourself some flowers and see how much better they make you feel!