Shaders or Decals for 3D Modeling Applications, Open Source
The images you see here were all used at some stage on one of my own 3D CAD models. I made them all myself of course, and you are welcome to take whatever you like. I am a very "messy" modeler myself, and I model in order to get renderings, not necessarily perfectly crafted models. My pictures reflect that as well, and some may need editing for your purposes first. If some haven't quite got the right colour for your purpose, you know the trick, I presume: Photoshop, "Replace Colour" function.
All the best with your models.