OP

Quoted from Griffin:

Sorry guys, I've released custom artwork in the past (Google "Paperboy Exclusive edition side art") and it ended up being a nasty experience with people taking it and selling it for profit, I'm not going to do that again.
Also this artwork is more a montage of other pieces of art drawn by various artists, so it wouldn't be right for me to distribute work that I really don't have the rights to, although that hasn't stopped others in the community already copying what I have done and selling work they don't have rights to for their own gain....
http://www.ministryofpinball.nl/nl/flipperkast-specifieke-onderdelen/bally/judge-dredd/judge-dredd-alternate-translite.html
That's their choice, personally I think it's extremely poor character to take others ideas and work and turn it into a pure profit pursuit. The work I do is out of a passion to create something special, a 1-off piece that others enjoy seeing and playing, not an opportunity to turn every last thing into a quick money maker.