We have learned quite a few useful techniques that we can now use to make something really cool or fun. But there are plenty of little tricks hidden within Blender that will allow us to make very realistic or intricate 3D graphics with a much lower amount of memory used. It usually takes an extra application or two, and the more advanced the program, the better; however, in the next few tutorials the Paint program--or it's equivalent on another OS--will be just fine for our purposes.
The purpose of these modeling tutorials will be to lower the poly count on your models--this could range from no effect to cutting out 99.99% of your original faces, and still being able to keep the realistic look you were going for. Make sure you have read over the other tutorials in this book or at least are very familiar with Blender, so you can better understand how to work these modeling techniques.