Christmas cards on a string! The traditional English way of displaying Christmas cards is to put two thumbtacks on the wall, hang a string between them, then drape the christmas cards along the string, nicely displaying them without getting in the way or gathering dust. I think it would add some festive cheer to this game as well as being funny from the themes the cards could be about.

Bonus points if the string could be draped in multiple waymarks or points, and visually fills up as you add cards to it, similarly to a smart bookshelf that visually fills up as you add books/cards into it (someone even modded that into Skyrim, it actually shows the correct covers of the books after auto-sorting them, so shouldn't be a problem for the professional developers). Some people prefer their card drapery to be zig-zagging in the shape of a Christmas tree, for instance.