I love dry shampoo, but I feel like I run out of the aerosol stuff so quickly! I've been using cornstarch as a homemade dry shampoo for years. I remember reading about it in a teen magazine when I was young - I also tried baby powder, but that went badly and I smelled funny. In the past 4-5 years, I've been adding cocoa to my homemade dry shampoo so that it blends in better with my darker hair. Baking soda is another newer addition - I like it because it can help cut down on the "greasy" smell hair can get after a couple days.
This homemade dry shampoo recipe is a great substitute for the aerosol versions if the strong smells bother you, too. I'm not a big fan of walking around smelling like alcoholic fruit or candy, and I'm sure you're not either. ;)
I've included a homemade dry shampoo recipe for both light and dark hair - it will make enough for tons of uses and you can fit it in a spice jar. And it gives thin, straight hair great texture - it ends up feeling thicker!