Whether you like the Facebook redesign on the web or not, you're going to be stuck with it soon. Facebook is letting the "classic" look disappear in September. The redesign first appeared in May and became the new default for users. But you could still opt out of using it. That option will be disappearing next month. If you still want to hold onto the blue theme, you have less than a few weeks to enjoy it.
Source: Engadget