Rule 1: Don't overcrowd, give them space. Sunflowers are not a social experiment gone wrong.
For when you really want to go against the rules
Rule 2: Use contrasting colors. Sunflowers are like the hipster of flowers, they want to stand out.
A tale of a monochromatic sunflower disaster
Rule 3: Don't forget the odd one out. That's you, the weird cousin of the sunflower world.