I made a playground that I put in a rubbermaid tupperware container as a playground for daily play time. I wanted to share with everyone..... It is basically some square thing with square holes from the craft store and some sea sponges from the paint section of the craft store. I then used aquarium sealant to glue them to the plastic thing. It can also be used as a background for them to climb on but I use it for now as a playground for outside time in the container. They love it.