First none of the wallpapers set are mine, all credits for the owners.
This is a transitions set for Linux, Ubuntu in my case Ubuntu 11.04beta it is working without problems. This will change like in windows 7 at 30 minutes to a new wallpaper "transitions backgrounds" this is not a new thing in Ubuntu but only now I learn who to make the .xml file, so i hope that you enjoy, for the owners of the wallpapers if I'm violating your work let me know, many thanks to all.
I have used the script @ http://gnome-look.org/content/show.php/Generate+Dynamic+Wallpaper+XML+File?content=136537