I used Natures Garden Sea Salt Caramel and Chocolate Fudge fragrance oils for this one. I did not combine them, but rather used them for the separate colors, which turned out amazingly. The smell is crazy good. I do have to wait to cut it as it is still fairly soft yet after 24 hours. And, with this one, I've embraced the vanillin, I actually wanted it to do it's thing. I'm super excited to see what happens on the inside.