In short

Pick a profession (past, present, future, fantasy).

Now come up with at least 7 personalized license plates for that profession. You have 7 letters and an optional dash to work with.

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Adapted from Unjournaling: Daily Writing Exercises that Are NOT Personal, NOT Introspective, NOT Boring! by Dawn DiPrince and Cheryl Miller Thurston.

A couple of books of personalized plates: Pl8Spk: California Vanity Plates Retell the Classics, "a retelling of classic and familiar stories using only the vocabulary of vanity license plates" and The Way Cool License Plate Book, "more than 400 amusing-and revealing-vanity plates organized by subjects".