Waterfall shower and bath - I'd add a divider that goes up and down at the push of a button so it keeps pool and shower/bath water separate and drain out. After shower/bath, the dividers go down and the area fils up to extend the pool.
Message Center - paint the back of a piece of glass to make a colorful dry-erase board. This is exactly what I wanted to do with my window frame! But it's just a frame, there's no glass :( Not sure where to find glass or plexiglass to fill it with
Starry Night: Cocoon-Like Bed Lulls You to a Peaceful Sleep. If you can’t sleep outside under the stars due to poor weather or deathly fear of bears, the Cosmos Bed from designer Natalia Rumyantseva is a pretty great substitute