We don't drink much soda in our house. We have a Sodastream for making our own, but rarely buy the premade stuff. I have seen really cool ways to use soda bottles instead of throwing them away, but we never have any bottles, so don't get to put the ideas into practice much.
Watch this video, and see how some people are using used soda bottles for a most unique contraption. This is probably the best way to recycle ever!