In thinking about what I "wish".... one of my favorites and best performers is tiny little Penny's Worth. I wish there were more colors and forms in the really little ones. They are so easy to tuck into the edge of a perennial border. I have Penny's Worth planted everywhere. I do have some small ones, but they are not as tiny as Penny's worth - Spacecoast Tiny Perfection, Mary Ethel Anderson, Little Wild Flower. Penny's Worth has tiny foliage and the blooms are sized right for the plant.
I would love to see a spider like Holly Dancer's color on a 12" tall plant with 1" blooms. How cute would that be?