Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the stylized_rock_generator zip.

Usage

1. Open the Rock tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose a design and press Add Rock, or use Shift+A, Mesh, Stylized Rock. The rock is built at the 3D cursor. Surprise Me adds a random one.
2. With a rock selected, the picture switches its design. Surprise Me makes a new random rock in place, Vary keeps the design and reshapes it, Colors repaints it.
3. The main page holds Condition, Rock Colors, Formation, Rock Style, the size, the color swatches and the Moss, Moss Type, Density and Snow sliders.
4. The sub-panels hold the rest: Blocks (block size, stones, arch thickness, detail, seed), Cracks & Rubble, Paint (texture, texture scale, edge highlight, grime) and Actions (Reset to Design, Make Plain Mesh, Delete Rock).
5. Make Plain Mesh turns the rock into a normal mesh for export.

The painted textures are bundled with the addon.