Black and White's Elkin Guzman Strawberry Catiope was delicious, and made for really wild espresso milk drinks in particular. The process is wild:

After this initial bout of fermentation, a mother culture of microorganisms is added to the tanks. These microorganisms have been fed molasses and strawberries for four days prior to encountering the coffee cherries, which gives them energy for fermentation and contributes flavor to the lot. The coffee is then left to ferment with this strawberry-infused culture for an astonishing 270 hours before being dried on raised beds until it reaches 10.5-11% humidity.