Skin Resources

[lSparz]

I use this editor for making my custom skins. They also have a library of premade skins you could use for your character.

http://www.minecraftskins.com/skin-editor
http://www.minecraftskins.com/

Another one I use, specifically for looking up skins for SparzCrafts NPCs:

http://www.mineskin.org/