Well, I've had a play and using DW's archway and a lot of luck I have come up with my first ever thingy.
I used a combination of programs. Elements ...very hit and miss and with more good luck than I deserve I managed to paste a cut out from the photo of a painting in to the archway....and then I used Paint.net which I am more familiar with to do a bit of cloning and use the cloud effects.
The only thing I would have liked to have done was to keep the whole thing larger as I have ended up with quite a small image. So I will probably have another go.
Anyone else game to have a go?