Everyone loves a vanity plate. Either for the comical creativity that might be involved (think "Back To The Future" and or just the sheer pretension of some owners (like the Lamborghini 'Bad Bull'.
License Plate Names - cute, but I just had to pin it since I have 2 nephews with these names - Jackson Cole & Jackson Ryan - bizarre.
Free printable License Plate Game for Kids! Could this be a summer travel themed scavenger hunt? Have the kids write down the license plate numbers (or replace the numbers with silly vanity plates).