
http://www.kidscreations.com/
To freshen just stir in a few more drops of oil, and change the baking soda every few months. I love these little pots, they leave a nice, subtle scent without chemicals or synthetic perfumes.
They're lovely in smaller rooms like the kitchen or bathroom, and inexpensive to make. I even used some old lace curtains for the fabric. The only trick is to place them where kids, pets (or you!) won't knock them over too easily.