Pumpkin Pie Paint
The kids loved painting with pumpkin pie paint. It was basically orange, yellow, and brown tempera paint with a mixture of pumpkin pie spice mixed in (cinnamon, nutmeg, cloves, and ginger). We smelled each spice as we added it to the paint and the room was filled with a beautiful fall-inspired aroma.
As a side note, I used a hair dryer to dry these faster and to diffuse the smell, and it worked for both purposes. We got to hang them up immediately.