For the full article about Rockhopper's backgrounds, see this article, and for a list of his backgrounds, click here.
Rockhopper Background is rare background since it wont come back ever. background in Club Penguin. It was previously available by finding Rockhopper and collecting came out. It was the first famous penguin background.
Rockhopper Background was available several times, starting from July 2007, until September 2010. The dates/occations of the release dates are mentioned below: