In need of ideas for Red Bull cocktails.

The red bull Flugtag is happening next week in portland. Some of their corporate employees are going to be having a brunch meeting at our restaurant which is across the street from the event. Our bar/restaurant normally does not carry red bull, but since they will be advertising the restaurant we will be offering a cocktail for each flavor. Regular red bull, cranberry, blueberry, and tropical. Any leads or recipes would be great. Thanks http://www.reddit.com/r/cocktails/comments/3eprlt/in_need_of_ideas_for_red_bull_cocktails/