When someone calls us to order funeral flowers, we always ask if they're familiar with our work. We're known for being less traditional than other shops, and want to be sure that we're a good fit for what the client is looking for. A funeral is not the kind of event where the client says "Just surprise me!".
Some cultures like to put long prayers on ribbons. There are no "rules" and it should be what ever brings the most comfort to the living.
Funeral flowers are a special way to honor the deceased and comfort the living.