Apart from the ‘SUR’ as the destination code this concept is already implemented by German Wings blind bookings which they describe as ‘Surprise flights at guaranteed fares!’
http://www.germanwings.com/en/Booking/blind-booking.htm

You decide when and where you fly from and also what sort of a holiday you want. After you enter your details and complete the booking, they tell you where you’re going and you can get planning!

Simply select your departure airport and the type of holiday you want by clicking on “Party”, “Snow and Skiing”, “Shopping”, “Christmas Markets”, “Metropolis Eastern Europe”, “Metropolis Western Europe” and “Culture”.

Have you seen Anything? It’s a Singapore beverage company that caters to consumers who respond to “What would you like to drink?” with a non-committal “anything” or “whatever”.

A few years ago, they launched two complementary brands: Anything and Whatever. Consumers don’t know which flavour they’re getting until they take a sip. Cans are simply labelled Anything and Whatever, and the list of ingredients is limited to generic wording: carbonated water, sugar, permitted flavouring, permitted colouring, preservative, tea extract, fruit juice concentrate.