Bonus Room :: A Poll

Hi folks. I'm working on a few different projects, and hopefully I can finish at least one of them to show you soon. The lack of pictures and finished projects around here is getting me down. We've had some teething issues, some sickness issues and some weather issues, but I think it's finally starting to look up around here -- well, except the weather, but that's not really in my control.

Today I have a poll for you. I hope you'll chime in and tell me what you think.

Sorry for the stinky pictures. It's bad weather and bad lighting and now nighttime. 

We have two living spaces.
We use one. So the other has got to go.

The couch is going to a friend who is moving into her very own dreamy house soon.  And there are two armless chairs which could go (hello craigslist!) or stay, depending on the new use of the room. The room is open to the kitchen and dining room, but doesn't work as well for a traditional living room/family room/den-type room. It really only has two walls: the one with the giant window and the long one the couch is on. Otherwise, there's kinda a walkway from that backdoor {on the left in the above picture} to the kitchen and the rest of the house. The picture below is the walkway wall.

This is the daytime light and a much better representation of the color. 

{And the mess usual to this house when rearranging.}

So, here's the poll:
If you had a bonus room, what would it be? What room in your house do you wish had more space? Have you used a room for something other than what it's meant for? Please share your tips and tricks. I'm anxious to here your suggestions and excited about all the possibilities!