I've remembered using a toy tyre as a stamping object in one of my layout. It is the "bicycle" layout in my family gallery.
Have you tried to be in a situation to buy a certain stamp just for that one layout or maybe you've wanted a certain print that there are no stamps available.
Why not try using toys. In my layout I've used toy tyre to create the tracks. You can even experiment with a lot of toys such as a toy dinosaur footprint. I will do that one day. Everytime when we buy a stamp, we seldom use it for more than once or twice. Save your money and buy stamps that are more usable in most layouts. Saving money is something that is quite essential to every scrapper.