Once upon a time at the Kibutz of the North, we had a bonus space, a mezzanine above the living room:
Take one very handy brother and his contractor-friend, slap up some walls, add a window on the staircase side to keep the staircase from becoming a dungeon, punch a hole on the living room side tolet in some light and hang some wodden shutters to make it easy to close at night when mommy and daddy are watching TV and you have a perfect little room for a perfect little girl.
For a while, there were vintage circus-themed curtains, but they were useless for keeping out the early morning sun and they were way too baby-ish for this now very big girl....
We happened to have an IKEA comforter cover still in the package. We liked the colors, but it too had childish animals on one end as a border. We are planning on getting her a big bed next week, but I think we can do better as far as comforter cover goes. However, the fabric was great, the colors were perfect for the rooms, so I hacked off the animal border, lined it with an old orange curtain panel and we now have roman blinds that look like fun summer awnings. And a finished room, minus the big girl bed.
she likes it. She really likes it.