I belong to Incredimail groups and sometimes we run into people using others graphics. Same thing, add glitter, change it somehow. And the person who created it has lost control of it.
Trying to reason with these art theives, one gets the answer that 'if it's on the web, it's public domain". I'm sure you've heard that one too!
Anyway, the book I'm reading had this and it pertains to what BoGoWo said:
Every work of art is an act of faith, or we wouldn't bother to do it. It is a message in a bottle, a shout in the dark. It's saying, "I'm here and I believe that you are somewhere and that you will answer if necessary across time, not necessarily in my lifetime."
(Attributed to Jeanette Winterson)