I'm loving the old suitcases for displaying things, like these cards. What really works here, aside from the colors, are the boxes within a box. It's a simple detail that is normally over looked. And look at the way she priced everything with the tags - clever.
This is a great way to display your cards. Here Sew Trashy displayed their Gocco cards in a blue metal container that they picked up at a thrift store. I think the tin adds color and will catch your eye. The only thing I would change is the hand written price tag. I'd suggest typing it up.