These files are not created by me. I just found someone share a complete package of it on facebook. Thank him/her for collecting all these Skin across the world wide web, I believe some skin files was updated or fixed by him/her.
So, I'll just provide a text file that contain the link to download these files from my dummy OneDrive Folder.
Album Preview : http://imgur.com/a/b1MHG
Installation Guide :
Pick any RO Skin that you like and Download it to your PC/Laptop.
Extract the files using 7-Zip / WinRar / WinZip / etc.
Copy and paste the extracted files into the %System%/kRO/Skin/ folder.
Again, I don't own any of these files. I just sharing the files. None of these are commercial items.
Please insert / remain the credits in case you know who're them.