You can't just photoshop more art on top of an original design and call it yours..
That said, I know Joe's stuff is licensed by Planetary Pinball.. are the Tilt Graphics designs licensed? If not he should not be allowed to advertise this stuff on pinsde... and even if they are.. pretty lame to undermine someone's business so close to home.
By the way tilt, if you actually did an original design while you worked for Joe that's JOES design, not yours unless you had a contract stating otherwise.
No one should be able to get away with stealing from this small community.