Marie Hebson's interiorsBYDESIGN Inc. If your referring to the bed, I'd have my carpenter replicate. Needs to be to code and extra safe for kids climbing and playing on and around. The artwork, accessories and such look like garage sale finds. Good luck!
I like the idea of space effiency, of creating 'room' eg: shelving and other surfaces without taking up floor space with bulky peices. In particular the ladder, which I'm thinking could make a great shelving idea. I personally wouldn't use a ladder, but gives me a great idea!