When you make your own images, remember after you finish, and before your ender, try wild new camera settings. This image improved greatly after widening the field of view. (I stopped short of tilting to the side.)

A German UBoat coasts through a naval minefield.

Bryce 5 handles complex models like this grass slower than Bryce 4, but the addition of the 'depth of field' more than makes up for it.
This is one of my more popular images. The grass in the foreground was even used on a Canadian postage stamp.

Solar particles react with the earth's magnetic field around the poles to produce lights in the sky.

Tiny fairies, no wonder they are so hard to find in the real world. I tried using a photo of an actual field in the background, although it's such a small area it's almost a texture map.