Want list: Colorful heels

(from top left: one | two | three | four | five | six)

I keep putting together these outfits from my closet that I think, Boy, this would look so much better with a colorful heel to go with it. Most of my heels are neutrals, with the exception of red, because it seems so practical. But now for spring, I think a colorful heel can be the new neutral. At the top of my wish list? Cobalt blue heels. I might need to do some serious looking around to find a great pair for spring. 

Which color would you add to your closet?