My oldest son has special needs, here are some of the items in that kind of room that have attracted his attention and had a positive effect on his growth and development.
To Touch - Tables with activities such as rice (to be played with like sand) or water and bubbles.
To feel and look at - Alternate the surface of the floor. Attach posters to the ceiling. Use light projectors to create shapes and colors with light.
To smell and look upon - A window filled with plants growing in dirt, sand, water, air; can attract the attention of a child for hours.
Oh and do not forget comfortable chairs or benches for parents and care givers to sit on!
