The jury contest, integrated by Artemis Papert, Gary Martin and Manuel Quiñones had select the following images:
How to use the background images
You need Sugar 0.100 or better to set the background. You can download any of the images and copy them to your "Documents" folder. Then you can go to "My Settings" and select the Background section.
A file containing all the images is available File:Contest.tar.gz
To install it, copy the file in your Documents folder and in the Terminal do:
cd Documents tar xzvf Contest.tar.gz
These images will be available by default in new versions of Sugar.