This year I purchased these two little bushes and they are just too pink for me.

the color is lovely by itself, but nearby are yellow lilies, orangeish geraniums, pink and orange cone flowers and some other orange perennial I forgot the name of. It's a fiesta of color! Pink, yellow and orange...its almost florescent! Blue with yellow and a touch of orange would be much calmer I think. So, I am going to attempt to change the color of the hydrangeas to blue. Aluminum in the soil seems to be the key for blue. Aluminum sulfate can be added and I think I'll try it. Here is the info I'll be following. http://www.hydrangeashydrangeas.com/colorchange.html

I'll let you know next year how it works out. (The web site says plants should be 2 or 3 years old, I think I'll add the aluminum sulfate in the early spring. We'll see.)