DownWell - creating platforms

Hi,
I’m creating an endless game where the player falls down vertically forever - like the game downwell. I’ve got platforms being generated randomly. What I need is the wall on the left and right to look like how downwell does it.

I’ve attached a screen shot of one of my platforms that was generated, but as you can see, the vertical walls on the left and right are just a straight line…

Any ideas are much appreciated.

I have since worked something out which looks a lot better, but I’m using simple random value which is choppy at best, I’ve attached a screen shot. I would like this to be smoother, is there a simplex noise method in unity that would be best suited for this?