Skin Stealer for Minecraft lets you steal skins using vaild Minecraft username and apply it to Minecraft PC, Minecraft PE (Pocket Edition) or BlockLauncher (a custom launcher for Minecraft PE).
• Press RANDOM button to steal random famous skins
• Save skin as an profile picture using Skin Avatar for Minecraft
For Korean users; please understand that all skins are public. Anyone can access it with a link provided by Mojang.
Because it's so many skin and a great app, highly recommended.