There are literally a hundred ideas out there, and free windows and doors being discarded EVERY DAY, but here's one simple hot house/green house (or even a playhouse) idea from Lucy Marr. Thanks for the great idea/photo to share!
I love the sporadic and chaotic look of this, and its something I've long wanted to do in tree house form- I certainly have the stock of free windows! Think about it...deep in the woods, in the shade of trees, but with windowed views in all directions. Sure, privacy might be an issue elsewhere, but again, far off in woods.....far off in the woods....
-Derek "Deek" Diedricksen