Sorry, I can't think of any thing either. I have entered mine into 3 different shows, and won in 2 of them, didn't need a "theme", just entered and paid the entry fee. The judges, and or the organizers placed it into their proper category. In the first show, it won for best metric cruiser, and same for the second show. In the 3rd show, there was just 1 trophy for all metric bikes, and the one that won was a hand built custom bobber based on an older 650 yamaha. Didn't feel too bad losing to that one, as it was probably 50% hand built.