Well, if we're throwing up theme ideas, here are some phrases that seem (to me) to offer possibilities in a similar manner to the starting three:
Laughter is the Best Medicine (or something like this that offers a strong suggestion of comedy without necessarily being tied only to comedy)
Money Talks (books where business and money play a major part)
Courtly Behaviour (this offers both legal and royal themes)
Nature's Own (books about nature or animals or whatever)
Eastern Speculation (not sure about the phrase, but I'd like a theme that encourages a selection from Asia)
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