Prototyping services for active, creative, and potentially bookless library spaces is an increasingly important activity in our digital future. The 4th floor of the Chattanooga Public Library is one of these spaces: It is a 14,000 square-foot public laboratory and educational facility with a focus on information, design, technology, and the applied arts.While it functions as a makerspace, hackerspace, and meeting space for the community, internally, the 4th floor serves as a beta space for prototyping and piloting new library services for use across the whole library system. This half-day interactive service design workshop uses a series of exercises and interactions designed to generate useful, actionable new services and service models. Attendees build with Legos, write, draw, and have tons of fun thinking of all the new things possible in the creative library space. You definitely take home something you will be dying to offer as a beta service in your library.