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The Grave avatars, The Grave icons, The Grave pixel art, The Grave forum avatars, The Grave AOL Buddy Icons
This may seem like a stretch but this reminds me exactly of the one screen in LoZ: Link's awakening with the single grave that you could push and there would be the secret dungeon inside. Maybe i'm crazy but the position of everything is really similar as I remember it.
I like how you black as both outline and a color to set it apart from ground elements. I think it's wonderfully effective.