Italian furniture manufacturer Dielle, has created what they call a ‘Container Bed’, which is a normal bed that has been raised to include storage underneath. It’s a solution designed for small apartments that often don’t have enough storage space.
DIY Sand and Rock Box by FSPDT. Gdjk -> made this with toilet rolls (aka tunnels) and moon sand instead of play sand. My son loved playing with it. The moon sand cleans up nicely indoors but play sand will be easier to play with when using the small cars.