Terragen
Anyone use it? It's a "scenery generator" (their words) where you can create photo-realistic landscapes with pretty minimal effort. Of course, you can also put in a lot of effort and then really create something dazzling.
I used it years ago and have been cycling through my old images as desktop wallpaper on my work computer. Decided I need something new and got me thinking about it and thought I'd ask here. Anyway, give it a shot.. it's easy to use and you can get something pretty neat looking just using the random features and the preset terrains.
Unfortunately, my old computer at the time was so slow that I generated most of my images in 480x640 and medium resolution. Looking back on them now, I wish I had done them in high resolution but even at the resolution I used it took over an hour to generate an image. On my P4 with my crappy (by today's standards) GeForce4 MX card, it takes about three minutes to do what I used to leave my old K6-2 500MHz on overnight for.