Decorate the walls with items that reflect the feel of the coffeehouse. Consider hanging for sale artwork, drawings or paintings from a featured, local artist. You can also have an area to list posters for upcoming theater shows in your area or keep a collage of Polaroid pictures of customers. If you have the space, think about hiring a professional mural painter to paint images of coffee beans, cups or desserts to fully engage your customers in the feel of the shop.