...I just couldn't get my head round all that switching around. I figured it out in the end. I wanted to put the "Cymru am byth" plaque I'd made for Eleri Ordovices, in the homesite of Arianwen Silures. They're both my personas and I made the graphic anyway.

So I right-clicked on the plaque, got the url from the properties and then put that in Arianwen's homesite. AW changed it to the image number and bingo! It worked!

Of course, I would never condone doing this with something someone else had made. But as I made the plaque and they're both my personas, I guess there is no copyright naughtiness going on!