I think the Rockstud flats are probably the most successful of the studded Valentino styles. They are easily more versatile than the other designs, and definitely amp up the cool factor of an otherwise normal pair of flats. They come in so many great colors as well (pink, yellow, red, and nude)! There are a couple nice double-takes out there of this style.
Sole Society Martine
H&M Ballet Flats