One of my favorites is frankincense mixed with coconut oil at night to relax me for sleep. Altho the coconut is quite aromatic as well, I like the combination of the 2.
Geranium oil and vodka (as a preservative) is a great bug repellant, and smells much better than commercial bug sprays.
Cedar wood, tea tree, lemongrass, mixed together make a pest repellant for dogs. I don't use anything poisonous on our pooch, not even dog shampoos, I make my own.