Generate a collection of 3D rock models of various shapes and sizes, suitable for a natural, rocky landscape. The rocks should feature rough, irregular surfaces with natural erosion patterns, small cracks, and layered textures that mimic real stone. Use warm, earthy colors like deep browns, sandy beiges, and subtle gray tones, with hints of moss or lichen to enhance realism. Each rock should have a distinct shape, from large boulders to smaller rocks, creating a diverse landscape set