Thanks everyone for the suggestions. Sweetsuccess, thanks for posting that photo, the mound of hydrangeas on the top is the look I was thinking about.
All of the hydrangea flowers I have in my backyard, as well as the silk ones inside the house and the ones on the wallpaper in my guest room (can you tell they are my favorite flower
) have 4 petals. I have never seen a hydrangea flower with 5 petals. That's interesting, fronklowes, that yours have 5. Where do you live? I guess maybe there are different varieties in different parts of the country? I'm in New York. Do the 5 petal varieties come in the standard hydrangea colors?