This house has become one of my favorites. I set this up in Mystic Isle, using my reward row lot deed, to serve as an example of what can be done without RMT or COTOs:
It's whatever you think it is. I don't actually sell anything, it's just decoration to make it look like my town is inhabited. If anything, I was inspired by the antique shop in the show Man in the High Castle. [edit] I added a couple signs: the left one says Antiques and the right one says Books.