Well.

Basically my wife, who is an avid crossword solver, always leaves her pen and diverse crosswords lying around in the bathroom. Or stuck in the cupboard sliding door.
So I made this holder for her, which I have designed so that I could attach it to the tiled wall with double sided adhesive pads.

edit: OH! I forgot - adhesive tape at top AND bottom.

I admit that in the end I simply decided to glue it.
My wall. My rules.