When we did our rooms I made up a "wish list" of things for each room and asked the congregation to donate. Boy, did they! I got everything I asked for and didn't spend a penny. People are always cleaning out their homes, and if you are specific on what you want, you'll get it.
I also went to garage sales and picked up things real cheap.
If you can do murals on your walls, make overhead transparancies from coloring books. Trace them on the wall and paint.
Blessings,
Julie Burton