With the help of Shawn Hargreaves and some other helpful peeps in the XNA community, I've just implemented a supremely sexy new feature. Whilst playing Clover, the watercoloured sky backgrounds will now slowly and subtley blend from one to another, so the sky never quite looks the same for very long. It works very well, and will help maintain a fresh look to the maps.
We're getting very, very close to being done now. There's only one small room that needs to be added, and then we'll have the game functionally complete. After this it's just a matter f polish and improving things like animation and artwork. In fact, we're so close to being done that Owen is already playtesting the game from the beginning.