I've been looking at a 2D physics game called 'Hill Climb Racing' (Android and iOS) and was wondering how they went about texturing the terrain?

I've had a think about it and I've come up with nothing and finding a resource on the web has proved impossible. Please help.

The game mentioned uses Cocos2d. Would it be just as doable in a different environment?

EDIT:

I was looking at another question: Drawing large 2D sidescroller level terrain

The end result is what I'm looking for, but in my mind I was thinking that there would be some way to add this effect (using small textures) to some terrain specified by vertices rather than making a very large image to match whatever is seen in the level.