Assuming the image is big enough/you didn't want one of the actual Grand Prix whatever playmats, which I think are $50+ on ebay, you can just upload the image, and have them print/ship it to you.
It's 25+ shipping if you're confident about the formatting, or 35+ shipping if you want them to format it for ya.
http://media.wizards.com/images/magic/daily/wallpapers/Wallpaper_Nykthos_Shrine_to_Nyx_2560x1600.jpg
I have seen people do this, I don't know if it's allowed though.
Assuming the image is big enough/you didn't want one of the actual Grand Prix whatever playmats, which I think are $50+ on ebay, you can just upload the image, and have them print/ship it to you.
It's 25+ shipping if you're confident about the formatting, or 35+ shipping if you want them to format it for ya.
Legacy Decks:
Legendary Maverick GW