That's a really tough one with Vue's terrain editor, I've actually resorted to using USGS DEM files in a lot of instances, just grabbing any old DEM from a hilly area and working with that as a starting point. If you don't want to go that route you could try using the mountain setting and applying a lot of erosion effects to it to get one hill, and then make more for more hills, this takes a little more work but I've found that almost all of the terrain editor terrains need a lot of work in order to look real. Hope this helps, if not I'll try some things later on when I have more time and post some screens here.