If you ask me, when it comes to soap design, it'll be difficult for one to be able to prove that someone really and truly set out to copy another's design. I came to believe this because of what happened to me a few years ago....
A few years before I ever started posting any pics of my soap on the web, I set out to make what I thought at the time was a unique idea- a soap with a snowy scene. Basically, I wanted to try making a soap in my log mold with falling 'snow' set against a dark blue evening sky with a pine tree in the foreground to go along with the Sugared Spruce FO I bought from WSP. In spite of such a scene being a common thing to be found on a gazzilion Christmas cards, I had never before up to that time seen anyone try such a design in the medium of soap.
So anyway, I made my soap and it came out better than I could have hoped, and it became a regular thing for me to make at Christmas for my family. Then lo and behold, a few years after I had been making said soap design, I happened to see 'my soap' on the internet when looking at soap photos one night. It totally freaked me out because it looked uncannily like mine, but yet I knew it wasn't mine since I had never posted pics of my soap before, and besides, the pine tree was just a little bit different than mine, and it also wasn't posted by anyone I could possibly ever know by however many degrees of separation that may have gotten ahold of one of my bars.
As wise Solomon once said, there's nothing new under the sun. Whatever soap design has been done before will most likely be innocently/unwittingly done again by someone somewhere else in the world, because as Theresa and Shari said, there are only so many designs one can do in such a small medium as a bar of soap.
I do agree, though, that intentional copying without giving some kind of credit to your inspiration leaves a bad taste in my mouth, and outright stealing of someone's photos and claiming them as your own is just plain sick and wrong, not to mention illegal.
IrishLass