Comment on this news article
Set a Different Background for Each Space - PC World
http://news.google.com/news/url?fd=R&sa=T&url=http%3A%2F%2Fwww.pcworld.com%2Fbusinesscenter%2Farticle%2F192427%2Fset_a_different_background_for_each_space.html&usg=AFQjCNF1sGKk3HGq8Yso4wjlV3Xagqi5tQ