Room Generation Without Adhering To Grid

I'd love to see basic room mapping achievable without adhering to a rectangular grid system. ie. generate rooms and passages independent of the grid. Real architecture is not bound by this contrivance which is a convention inherited from RPG tradition. It would be great if you could draw each area or "room" you want to populate using a multi-point tool like you have in Photoshop. I realise this might not possible though.