With the release of Aerosmith with matching Dirty Donny art blades, Metallica now looks especially bare having been left out of the official art blade pool. The third party art blades don't really look that great and definitely don't match the art style of the playfield, backglass, and cab.
I asked DD about it and he said he's willing to do it, but it's up to Stern. With Stern re-running Metallica on a re-upped license for the foreseeable future, I have no idea why they wouldn't offer this.
So, here's a poll to gauge interest. Maybe it will help Stern make the right decisions and offer them.