Quoted from domijr:

Take a look at the post from the guy with the pics of the decals above, he mentions the user "joeraptor2003". I checked his profile and it seems like he's made some for different machines. I'm sure he can help you out. The guy that made The Simpsons, does not have Family Guy.
Edit: Actually, since you have The Simpsons also, maybe you'll like to get them for that one also . I'm not sure if he has anymore available though, but you can try sending him a msg. http://pinside.com/pinball/forum/topic/tspp-simpsons-pinball-party-custom-side-board-decals

Quoted from domijr:

Damn, that sucks. I'm sure he'll make more with enough interest. I know the guy that made The Simpsons side panels made some more since others wanted some.

Quoted from joeraptor2003:

Hi Guys
These are no more. I just happen to have an 1 old set I made for friend around..and that was it.
But I would check with Sillyoldelf and see if he if he is interested. He did a great job on the TSPP and it seems that there is enough interest here to get something done.
Thanks
joe

Quoted from playernumber4:

I have a pair of the original joe raptor side art for the inside of the cabinet. I never used them and am tired of them taking up space in the spare parts area.
$60 plus shipping and they will go to the first responder. i can take pics in a few hours if you wish but they are the same as the ones above with the houses on them.