The picture is taken from Image portfolio 1.3, by Tony Perna. I did the treatment myself in photoshop, with a scanned in piece of slate that fell off my roof.
A low budget cover, but hopefully effective, and I think it says a lot about the approach we've taken to Sorcerers in the book - there's a strong superhero theme.
I'd put a bigger version up, but I'm running close to the limit on my website's disk space, so until I can get that sorted out a small one'll have to do.
Cheerio,
Ben