I like the idea of decorating inside with a Chalkboard (which I have) and some bunting (which I also have). I also like white inside. Since some of the frame is metal, we can consider some magnets?
The Duncan Family: Indoor Playhouse
playhouse - like the idea of kitchen on one wall More
The playhouse project! playhouse table, playhouse decor, playhouse shelves, chalkboard, books
Playhouse interior decor ideas for girls
I do this in class! Each student has their own bucket. It's full of crayons, a pencil and a whiteboard marker. The kids love it! We use the buckets throughout the day!
Kids' Mailboxes - could be very sweet mounted outside the bedroom!
Before & After: Backyard Shed to "Small Piece of Heaven" Playhouse | Apartment Therapy
Height enough to build loft? Paint inside white