Lately I've been obsessed with how a simple clue like 'strong suit' can unlock so many playful theme directions in a crossword. For me the most immediate read is the idiomatic one — 'forte' — and that opens a tidy theme where each theme entry is someone’s particular strength: think 'COOKING SKILL', 'MEMORY TRICKS', 'PUBLIC SPEAKING', 'CHESS OPENINGS'. You can make the revealer be 'FORTE', clued conversationally, and then have longer entries that read like personal superpowers or talents. I like mixing lengths so the grid breathes and the revealer sits near the center.
Another angle I adore is the literal-suit route. Here 'strong suit' becomes a wink toward types of suits that imply power or protection: 'POWER SUIT', 'SPACESUIT', 'WETSUIT', 'CHAINMAIL
Armor' (or 'CHAINMAIL'), 'IRON MAN ARMOR' if you're doing playful pop-culture. Cluing can lean punny — 'What a CEO's confidence might be, literally?' for 'POWER SUIT' — and you can sprinkle in related shorter answers like 'BLAZER' or 'TUX' to connect the clothing family.
Finally, there's the card-game twist. If 'strong suit' is read as a trump suit, you have a neat theme using card-related phrases: 'TRUMP CARD', 'HEARTS AND MINDS', 'DIAMOND RING', 'SPADEWORK' (a stretch but fun), 'CLUB PROMO' — basically entries that include the names of suits or card concepts. I used this in a themed mini once and loved how solvers reacted to the reveal. Personally, I favor the mixture of pun and straight cluing — it keeps the grid cheeky without feeling gimmicky, and that's my kind of crossword magic.