I've noticed this for quite a while but never posted it. If you've ever used the single player commands mod there's a command called skin. It skins the current skin of other players if you type their username in. So I was experimenting one day and I typed into single player commands "skin Herobrine" but without the quotation marks. Then I went into my inventory and checked my skin. It was the exact skin of Herobrine, Steve with blank eyes. I've always thought this was cool.
The Haunted Herobrine skin