I'd love to run a Harlequin army with 54 models. ; 6 units in total, consisting of 13 guys each and two HQs who do their own thing. Obviously based on a deck of cards. The two HQs would be the Jokers and I might throw some specials in like the Ace of Spades and the Queen of Hearts.
This was actually my original idea for my Harlequins back in 2ed. I never quite finished that idea, but if you look at some of my older models you can find the suit symbols on them.