As far as I know, there's no real demand for them due to the internet being so prevalent (Think about what site you're on for a moment, then remember that it's not the only one of its kind). I mean maybe as a collector's thing, but I have no idea how to go about selling them like that
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http://img.imgcake.com/RegaroUlquiorrapngse.png
http://nightly.mozilla.org