Welcome back to the souvenir dungeon. The happiest dungeon on earth!
You could eat a little cucumber sandwich off of one while watching TV. This red example is my favorite, by the way.
I assume that they were sold as a set. Could there be other trays with other vehicles? The horseless carriages? The Omnibus? The surrey? The motorized fire truck?
Salmon pink, oh yeah. Maybe you were supposed to buy four, and you could share three of them with various friends or relatives?