Things You'll Need
Instructions
Visit the Garden of Eden Creation Kit website. With the G.E.C.K. you can mod either Fallout 3 or Fallout: New Vegas. You can create new terrain maps, characters, scenarios, weapons and armor.
Download and install the program. It must go in the same directory as either Fallout 3 or Fallout: New Vegas. Fallout's native modeling format is "DDS." Photoshop CS5 does not export in this format. Fortunately, Photoshop accepts third-party plug-ins to enhance its functionality.
Visit the Nvidia Developer Zone. Download the plug-in and place it in your plug-in folder. The next time you load Photoshop, you will be able to import and export in "DDS" format.
Open the Fallout textures with Photoshop, then edit and adjust them. Save each file under a different name. Open the G.E.C.K. to build your edited files into scenarios for Fallout: New Vegas.