Low poly terrain generation

Hi guys,

Does anyone know any asset or script that can help me produce these type of terrain. http://th05.deviantart.net/fs71/PRE/i/2013/243/4/d/3_by_prusakov-d6khb94.jpg

I want to be able to quickly makes these using the same prefab or by using a tile system. The game will be made for mobile devices.

Thanks.