A school-bar combination (for adults obviously). God, where is it written that a school must be a stuffy, bleak, dehumanized warehouse? Are flourescent lights, cramped desks, tan carpet, and whiteboards mandated by the UN?
If I had the money and the lifestyle (ie, I could stay in one place more than 2 years running) here's what Id do: Id open a TESOL pub. The "school" would completely capture the pub vibe: hardwood bar and decor, dart board, intimate corners with track lighting, etc.
The TESOL pub would serve good beer and a small selection of pub snacks (pub grub). Students and teachers would sit at tables in the bar during "class". [In fact, there's a study that shows that one drink improves language acquisition in most participants

See http://sdkrashen.com, http://www.effortlessacquisition.blogspot.com