This is the first time I've really spent time with terrain, I'm not particualarly good with it, probably due to lack of practice, but I normally stick to atmospheric stuff. Anyhow, this is my first project aimed soley at terrain, it's basically an asteroid that's crashed into a wide chasm and been left to the elements for hundreds of years. I used that trick of moving a secondary planet close to the main planet, in this case straight into it. I don't really like the water edge by the bottom of the render but I'll fix that in the next render. Also I'll make the textures a bit more interesting, it's just a basic sandy one on the main terrain at the minute and a couple of simple surface layers on the asteroid.
One thing I would like to draw attention to is the erosion to the far left of the render, where the asteroid had dug in under the terrain on impact and wind erosion has worn that terrain down. Took me 3 days to get the right, hope you like it.
Any suggestions would be cool, oh and I think I'll tweak the lighting to make the near side of the asteroid a bit more interesting to look at. There'll also be some hidden surprises for the sharp eyed in the final render.