We had some friends over and I actually cooked a proper meal (they are good friends and understand our chaotic lifestyle, so can be offered a take-away). Played on the wii and generally caught up so it was a good night. And no headache, so I can do some messy work today for a WoW article.
Meanwhile, on with the displacement maps. Thanks for the comments - glad it was useful. Yes, indigocarole, you need PSP 9 or higher for the displacement map filter.
This is the Photoshop Elements version. I don't find it as good but I am willing to be corrected. I like lots of things about Elements but it is never my first choice.
Using the Peony pic as my main image.

...and displacing with this fossil design. I have to make sure that the image I'm using as a map is saved as a .psd file and that I know where to locate it.
Then go to the Filter menu and Distort, Displace.

Increase the size to 100 in each box (try different options here). Say OK and you will be asked for the file name of your map.
Here's the result.
Looks better after a few more filters - such as inked edges etc.

That's it folks. Gesso - here I come.