Making a tileable scales image in Blender Internal
So, the first thing to do is to obtain a tileable grayscale reptilian scales image; we'll start from an already existing image obtained from an old and larger texture I had painted in Gimp for a dinosaur model some years ago… but that's a different story.
In any case, if you prefer, you can paint a new reptilian scales image from scratch by using painting software such as Gimp or Photoshop or open source applications such as MyPaint (http://mypaint.intilinux.com/) or Krita (https://krita.org/).
Getting ready
We are taking for granted that in your Blender User Preferences window, you still have the Import Images as Planes addon enabled; if not, start Blender and just enable it as already explained ...
Get Blender 3D: Designing Objects now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.