Here is the default wallpaper of Ubuntu 8.04 - Hardy Heron.
This is one most amazing artwork wallpaper I have ever seen!! or I can say that, This is the most beautiful default wallpaper, among all versions Ubuntu till date. (FYI: Ubuntu 7.10 - Gutsy Gibbon Beta had the most ugly wallpaper, Check it out here..)
Original version: This wallpaper was present in Ubuntu 8.04- Hardy Beta.
Polished version: This is the polished version of above wallpaper. This image will be the default wallpaper in Hardy.
Right now I am using this image as my desktop wallpaper with Gutsy.