Salty Cocktail Bar
Cocktails are always nice - but they're usually very sweet, too, and that may not be everyone's taste, at least not for long. Sure you can always throw in a Bloody Mary between two Pina Coladas, but that's about all you can choose from when it comes to salty (or non-sweet) cocktails.
I propose that someone starts opening a bar (chain?) serving cocktails based on vegetable juice. Vegetarian shops offer a wide range of potato juice, red beat juice, etc. but as far as I know the word hasn't been passed on to the cocktail makers yet. The ways to go for now would be to promote it as a speciality bar, but in the long run I would like to see a decent selection of sweet and non-sweet cocktails at the same place.
Reward: Free cocktails!