Update: I used this and a few of my other creations to make an epic landscape so if you want to see that here it is.

http://www.planetminecraft.com/project/large-custom-terrain-with-lakes-mountains-etc/

This is a very large mountain made with voxelsniper. It took about 20 minutes and I think it looks pretty cool. Also is was made in Tyken's low grass test world. I added a world save but be warned the save is in the map that I learned how to use voxelsniper in so there are a few huge random creations lying around.