i found something ineresting on modmymoto.com
"hey guys i dnt kno how this worked but it kind of did i followed these steps but instead i took a e2 skin the ezx file and changed it to mytheme.phm and it actually changed the color on my phones skin. try to play around with it you never kno use these steps b4 doing that To install skins,create a folder named "mytheme" in your TF card.Copy the "skin"(if any) there and rename the .phm file came along with the skin to mytheme.phm.If everything is done correctly,you'll see the newly installed skin in the phone's theme menu.
Thanx to zjole and yano from motohell i figured this out
I didint notice but all i got was a mix of all the skins 4 sum reason i dnt understand why that would happen.
What happens is that a 4th skin appears with no name and then depending on the skin you chose b4 chosing that new one that will b the color u will mainly get and the some parts will appear as the cmcc color orange so its kind of cool.
edit i deleted the my theme folder and the phm file and i still get the skin 4 some reason."
i don´t understand everything but i think he has found a possible way to install skins on Z6