I have had these pictures on my camera for a while - I apologize for the quality in advance. The shop was kind of dark with accent lamps in all the wrong places for photography!
A local floral shop had these miniature resin doors for sale.
They are about 6 - 8 inches tall and very detailed
They are to place around the garden, or attach to a tree. I even came across one story online where the homeowner stuck it on the wall next to the front door.
I googled "fairy door" and "gnome door" and came up with 100's of results. They may not be new to you, but they were to me. Very Clever!