This is a great plugin, thank you for making it. I did however have a small suggestion that may help clear any confusion up. On your default skins GUI. The picture of the skin shown should reflect which one is active. Right now, if it show the stone skin, that means its not active and you can apply it... Was a little confusing at first... I think it would be easier to understand if the logic was flipped... Just a thought...
keep up the great work.