Here's one that I was experimenting with a while back. The little white thing is a nematode on a watermelon root in a greenhouse. It's about 1/32" long. It was so small that I couldn't see it in the viewfinder so I just took a bunch of shots to see what I would get. I took it in TIF then enlarged it until I got this. It's pretty blurry but considering the level of enlarging and my 4mp camera, it actually came out quite good.
While a macro shot like this isn't anything that I want hanging on the wall, it's interesting to play with.

These nematodes are death on plants. You can see a lot of damage to this root.

Dick