The Slay the Spire collector's edition comes with small plastic baggies for each character to store their gold and other tokens between sessions. It also just so happens to have four little storage areas with character icons on the bottom, which were just begging for little cups.
I've taken to storing each character's unique tokens and starting gear to make setup quicker and avoid everyone fighting over the token tray:
There are two different shapes of cup--the “edge” pieces fit in the Ironclad/Watcher slots and the “middle” pieces fit in the Silent/Defect slots.
There are two variations of the design--the “vase mode” parts can be printed in vase mode for minimal filament use and quick printing but have no lid, and are perfect if you only ever store the box on its bottom. The other option is corresponding cup and lid parts, which will make tokens less likely to migrate out if you store the box on its side.
The author marked this model as their own original creation.