I haven't got time to read the whole thread - so I'll just give the details of my stolen image.
This is the one image of mine I know about  - thanks to Gradient for pointing this out to me!! - 'Fairy Flowers' posted on Xwall by gdmora:

Original image: Cymbidium
http://www.renderosity.com/mod/gallery/index.php?image_id=1332844

Stolen image - gdmora

http://xwall.metropoliglobal.com/galerias/datos/media/361/fairy_flowers_by_cymbidium.jpg

I've mailed gdmora here at Renderosity - not had a reply yet!

My sympathies to the other artists who've been ripped off!
Cymbidium