I didn't use lo-res models as the tiny trees in the background, so this image had over 22 trillion polygons. (69.6 trillion when rendering the dynamically generated parts.) Defiantly NOT a model of efficiency.
This image rendered for three days on 4 computers before crashing, and losing all the work. I rendered again at wallpaper sizes only, just to get it online. I may never try rendering a commercial version of this one again.
A still life arrangement of Poppies, I expected this to render without the difficulty of some of my more complex images, but it turns out the hairy stems using complex displacement maps to create the hair, never rendered he way the preview versions did.