Seidel These are easy to make and allow kids to explore in a variety of ways. Learn colors, explore the Science of liquids, create fun works of art, and engage in sensory play in a mess free way. There is no clean up with these and the FUN never ends.
This is the most complete site I have found for full sensory rooms, sensory studios, soft play rooms, training and more. Also the site itself does some interesting explanations of the differences between sensory rooms versus soft play, etc.
Look at ways you can use products not "intended" for sensory rooms and integration that meet the goals and more. RhinoGrow LED Grow Lights are bursting with color- and can give the added benefit of creating your own indoor sensory gardens.