Sorry for Necroposting, but I Wish for More Types of Generators.
Firstly: Ground based Ones, such as Grass, Dirt and Gravel.
Secondly: some Other Patterns, Such as Bricks that aren't Random and can be used to create Stacked bond Bricks, Herringbone and its Diagonal Variant; Metal Patterns Like Diamond Plate, Hexagon and Grates that are Rectangular or Round.
Finally: Scratches, they can be Random or Directional. and can be Sized up and Down to Make Tears.