Use a lemonade recipe (this one looks amazing!) and add 6 frozen strawberries pureed in a blender/food processor. Not only does your lemonade taste better, it turns a beautiful shade of pink.
If you're not in to the strawberry pulp (it does add another element to your pink lemonade), just add the frozen strawberries to your lemonade to give a pretty contrast and color to your pitcher.
And, by the way, does it date me that I can't get the song "Strawberry Wine" to stop playing in my head while I type this?...