Well if I could only do one room entirely, I would do my room with a tent. Tents are harder to put up week after week. Your walls could be where you see your tent. Some people make their blue with sponge clouds, others make it desert, ours is set in rock mountains with blue sky above. I've even seen some that have more of a worship tent set inside stone walls.
The other rooms can be "transformed" through props, furniture arraingement and backdrops hung on walls.
Sheila