I painted the inside white and wallpapered each room. I also made some pieces of furniture, and painted a lot of what came with the house.
Here's a quick walkthrough, starting from the top:
A pretty basic kitchen and dining table. I added the felt rug as the room was looking a little too white.
I made the coffee table from balsa wood and the lamp using the bottle Hoyts brand if Saffron comes in. I also crocheted the cushion to match one in our living room, and painted the bookshelf.
I'd love to add more miniatures, but with a two year old I know that whatever is not broken or lost I will constantly have to put back in place, so I'll save it for another time!