Skinning messenger is a very complex thing, the documentation provided with the newest build (which I believe Patchou put a lot of hard work into) will help you with formatting your skin and creating simple skins using the abilities which MsgPlus provides in its own engine, but the extent of interface manipulation possible is too vast to be
completely documented and I imagine a lot of it will be discovered by experimentation and passed on by word of mouth (well, forums
).
That being said, it is very possible for
anyone to make a simple skin.