Activity for Terraca

So I didn't put much thought into needing a card box until my step mom brought it up recently. So I need some inspiration! Show me your DIY or bought card boxes Also, does it have to be locked? I've seen both, not sure which way I should go....

Well, my wooden card box isn't going to happen. Because my grandfather has taken it upon himself to declare that it won't work, ask three other people, and get rid of my wood I was planning on making it with. I'm not sure I'm going to make it to the...