My theme would be Books! I'd call it something cutesy, like Come Write Inn. The theme would be expressed with books. In fact, it would be a combination of book store and cafe. People who are waiting can browse the book shelves.
I'd also have an online ordering system at the tables so patrons could check out what books were available and order some to go!
Plus there would be an area just for people who want to write, especially the people participating in NaNoWriMo!