Ok so looks like the possible themes are
Convertible, lawnmower, kitchen, puppy, ambulance, battleship, excavator, firetruck, but I can't seem to find the 9th prompt.
Viewing post in Very Accurate Vehicles comments
First, learning someone is trying to 100% my little goofy game almost a year after release is the best way to start the day...thank you! Second, congratulations, you found a bug! I just looked back through my code, and in my rush to finish up and submit, it seems I put "convertible" in under two different scenarios. Whoops...