I found a little unfinished wooden box at Hobby Lobby a couple of years ago. It has two sections for holding two decks of cards. I decorated it with my initials on the front and added ribbon inside to split the two compartments into four for holding ATC (Artist Trading Cards).
These are a few of my early cards, usually trying out different techniques.
I wish I could find another of these boxes because this is really handy for taking with me to crops and classes, and I want to make one a bit different. But at least I have this one.