Sony should redesign their controller to have a four-leaf clover button, heart button, and a horseshoe button.
But in all seriousness, it would have done wonders if the buttons were actually shaped like the shapes that represent them. For example, the square button should be square, and the triangle should be well, a triangle... why the hell couldn't that have been done? That way you wouldn't have to look, because you could physically feel with your fingers exactly what button you were pressing.