When the Voyager spacecraft were launched in 1977, they each took a golden record that contained information about earth. Music, greetings in different languages, images of life on this planet. NASA has started a blog for suggestions to cover the last 30 years.
http://blogs.nasa.gov/cm/blog/voyager-goldenrecord/posts/post_1187299526389.html
What would you suggest? How would you like another civilization to perceive us? Based on the 80's videos on VH1... an alien race will think we all have big hair!