Make up chess sets
Is it normal to make up your own chess sets? Not actually to build them, but to think, "Okay, if I made [example] Star Wars into a chess set, would Luke be the white king and Vader the black king? Who would the queens be? The bishops?" etc. I just like to think about that every once in a while.
I also do it with card suites. ("Who would be the ace of spades? King?" etc.)