Patterns from local designers. Lots of samples on the wall, and PLEASE don't put up ones that haven't been quilted yet. I know it's easier to make and store tops, but I want to see actual quilts. I'm a value shopper - don't care if it's this season's fabric or not, if the price is good. A place for the DH to sit so he can wait PATIENTLY is always nice. Good lighting is a must. If there's room, small shopping carts are nice and might encourage people to buy more.
You will have a wonderful store, because you are already attuned to the customer's wishes.