You have asked a very difficult question. My particular taste in colors goes with my mood and what I'm into or what strikes my fancy at the time.
I find it really hard to find a good peach color. Usually what they call peach is more pink than peach.
It would be really helpful if you had the solids to go with the 30s prints. My LQS has the prints but very few of the corresponding solids.
If you would stock the building (bricks, stones, etc), weather, and water fabrics, that would be helpful. There was a quilt store in either Oregon or Washington state that specialized in those fabrics but I think they're closed now.
Good luck with your store.