If you want to make a Texture Package for Radar Mini Map (you can change overlay(orig: face.dds) and compass wheel(orig: wheel.dds)):

• Download Addon.
  
• Change:
  Folder Name, to your Texture Package Name.
  MyRmmTextures.txt Title inside, to your Texture Package Name.
  MyRmmTextures.txt FileName, to your Texture Package Name.
  script.lua "youraddonname", to your Texture Package Name.
  
• Copy your texture files into texture folder.
  
• Insert your texture names and filepaths to lists in script.lua.
  
• Test(RMM > v0.33 needed) and Publish the texture package.

Textures will be shown in a dropdown in RMM Menu as: youraddonname~yourtexturename

Help File: (Image Projects)
Photoshop
Gimp
The red is map.
You must have inner only red visible and outer only transparent.

DDS Export:
Photoshop
Gimp