Ok so what does this mod do?
The Login: Login2.rar
This changes the background, swf background, music and text of the login screen. No worries, nothing here to log or transmit your login info, look for yourself.
The Champs: Champions2.rar
It changes all the champ gfx to adult content. Nude images of almost every female champ listed below.
The In-Game Mod: IG_SKINS_1.1.rar/Skin Installer Ultimate.zip
This will change the loading screen images as well as the champ icons during game. This will not mod the skin of the champ itself.