orange essential oil is one of my absolute faaaaaavorites! It's not as frequently used, and although regular orange oil can be readily found, wild orange is said to have more and stronger properties. Its aroma is obviously citrusy, but very sweet too. I love to use it in my car, diffused in a room, or even a drop in a water bottle or smoothie.
It's most commonly used for digestive and immune support, as well as skin health. But I think of all its uses, the emotional impact it has on the mind and heart are probably the most popular.