A “Vulcan Mind Probe” (or simply a “Mind Probe”) is made with Blue Curaçao liqueur and pineapple-flavored vodka.

Wikipedia describes an interesting fact about Curaçao:

“The liqueur has an orange-like flavor with varying degrees of bitterness. It is naturally colorless, but is often given artificial coloring, most commonly blue, which confers an exotic appearance to cocktails and other mixed drinks, given that almost no drinks or other foodstuffs exist that are truly blue colored by nature.”

The flavor of curaçao is quite unique, but unfortunately there is nothing else (to my knowledge) that it is used for other than alcoholic beverages.

References-
http://www.drinknation.com/drink/Vulcan-Mind-Probe

http://en.wikipedia.org/wiki/Cura%C3%A7ao_liqueur