My kids share a bedroom and we're looking at putting in bunk beds to save space and give them some floor area to play.
A few years back, I remember seeing recommended a company that does bunk and trundle beds that are adjustable, so you could start them on a low level and make them taller as the kid grows. They had lots of options for things like drawers, shelves, you could make it a short loft or tall loft, and there was a way to add a fort underneath, etc.
I can't remember the name of the company now. Does anyone know what I'm talking about?