This is a witty piece, and due to its fairly small size, it allows you to have a bit of fun without committing to a full-on fantasy feel in the room. I'd fill the shelves with very normal items that you'd find in a curio to juxtapose the abstraction of the design and play along with the notion that there's nothing unusual going on here at all.
If you prefer to highlight the quirkiness of the cabinet, you can choose bright, custom colors for more of a fairytale feel. And yes, the door is funct...