Well, the photo I found by just doing a Google "image search", but that toilet was said to have been (for a while) at the Guggenheim Museum in New York. There were a bunch of articles about in the recent past, one of which is this one:
"On the throne: what it's like to use the Guggenheim's solid gold toilet" (The Guardian) (If I had a bunch of gold, I think I would use it for something else, not a toilet. Good old porcelain is good enough for me!) :-)