Hydrangeas are my favorite flower. Unfortunately they don't grow really well in Colorado but the Vintage Harvest Hydrangeas by Hana Bay Flowers in Half Moon Bay, CA are my favorite. I picked one up last year at Whole Foods and saw recently that they had them again.
I have it as a potted plant because I can't keep it outside year round in Colorado. We have below zero nights and they won't tolerate that. I even got mine to flower again this year. I'm a super dork and spent a lot of Sunday afternoons googling and reading up on plants and flowers I like and I learned that hydrangeas won't bloom off of new shoots only off branches that have been established. They are also super cool because you can change the flowering color of a plant by changing the acidity of the soil.
The Vintage Hydrangea page also has a link for care instructions. I'd post a picture of mine, but its not quite as pretty as theirs.