Simple stack of multiple fabric-covered foam pads. makes a cushy "sofa" in the playroom, and can be pulled apart for multiple sleepover guests, movie night pillows, or tumbling games, etc. (they have fabric covered foam mattresses at Jysk)
From bread box to charging station. Convert a bread box into a charging station for small electronic devices. Just drill a hole in the back, insert a rubber grommet, and thread the power-strip cord through.