I want to build a tiny diorama of a 1/35 motorcycle, and am having trouble finding bases this size. Does anyone know where I can get readymade and stained wood bases this size? Wave actually made some great ones with wood texture, but they are too low. They are the perfect size though.

You can go to a trophy shop.

You will find plaques and bases in all sizes...all heights...and shapes.
These are available in many colors and finishes.