The document provides instructions for creating custom materials in Autodesk Revit by starting with existing photos and using tools in Photoshop like layers, selection, and transform to manipulate the images so they tile correctly when imported into Revit. It emphasizes using guidelines and offsets to ensure clean edges, testing large patterns for repeats, and resizing images to a minimum of 128 pixels per foot before importing and adjusting gamma and bump maps if needed. The custom materials can then be saved to a central library file and transferred between Revit projects.