put all your skin in desktop if you have skin.img or not, then find a Skin Selector of: http://www.gta-modding.com/area/index.php?act=view&id=254

made by:
www.models-resource.com (The Models Resource)
Paint.NET
3ds max 7
TXD Workshop

you can make own mod in your character models in (The Models Resource)

this model converted by:
SpongeBob SquarePants: Lights, Camera, Pants! (Xbox/PS2/Gamecube)