1. Walls to separate rooms
2. Fireplaces (As already mentioned)
3. Customization of the shape of the interior of the house. Make it so it can look like an old bog house and not perfectly square.
4. Have holes that you can fall through to the lower level
5. Basements
6. Be able to flip chairs around so they face the wall. (This is probably really hard to do)
7. Have sections of floor style different. This would work well with idea number 1.
8. Ladders going up to next floor.
9. Balcony
10. Be able to lock items to the ground so others can't pick it up.
Most of these ideas were in the old housing but would love to have them in the new housing.