The story so far:
Some guy decided to make a huge list of random Ubuntu repositories around the web, and he recommends people to dump it to their sources.list without thinking:
Hundreds of people (most of them Italian) have obeyed him without realizing that the maintainer of ANY of those repositories can do ANYTHING she wants to their systems: destroying or stealing files, stealing passwords, criminal activity through the computers…
Oh, and my repository is listed as well.
I made “new versions” of the packages containing the default Ubuntu and Kubuntu wallpapers, where the image is replaced with the following friendly warning: