As my little kid starts to get older I have been thinking about how fun it would be for him to have a little modern playhouse play in. While the selection of off the shelf modern playhouses is pretty sparse and costly there are some really nice examples. My favorite outdoor example is done by modern shed and retails for $2,600. I assume you could probably pull of a DIY version for about half that. Speaking of DIY the indoor modern shelter by Studiomama is a great example of what could be done with a little imagination.