Arter compiling 140 lines of spreadsheet containing all possible meanings of themes and game ideas for them, I came to conclusion, that they are not so bad.

Sure, some of them will result in tons of similar games, some of them are not exactly doable in 48 hours for my level, and for one of them (I'm looking at you, Side Effects) I still have no original ideas. Yet they are somehow giving me hope of coming up with something ingenious at the last moment.

So I'm pretty sure it will be a fun ride whichever theme will be chosen. Good luck, everyone!