So a while back a user called Earwig posted about an Arthur episode where one drawn character didn't have a head. The idea was someone could send in their own photo to be mapped onto the character. Such a thing never aired on PBS.
I dug it up myself, though I think one of these was posted on here before - oh well. I couldn't believe this was actually made, as opposed to being some benign plan that was shelved before it was developed.
When I grew up watching Arthur, I can't recall seeing this promoted in any form. It obviously dates from Season 5, going from Puberty-Yarmush's voice and the slightly jaundiced animation (a"highlight" of season 5). Apparently it was done for PersonallyYoursBooks.com - they do other jobs similar to what was done for Arthur.
Teaser video: https://www.youtube.com/watch?v=HKBmNf3TLJI
One episode: https://www.youtube.com/watch?v=J3898dPx9g0
When I first saw it, I thought it may be a fake (or one of those wretched but oh-so delightful parodies). But inspection of the specimen has revealed it to be plenty legit - sadly. The photo-mapped head looks very cheesy. It would have been better (though perhaps more expensive) to render the kid as an animal-person the proper way. The name "ANDY" is also badly dubbed in - only two audio bits of "ANDY" are used, and it is tacky.
There are also many songs featured in the one known episode - it's not that great, only Buster's song is passable.
What is shown of another example in the teaser video is no better - only a kid D.W.'s age could think it was such an amazing thing.
The character all seem more gimmicky than usual - I can't exactly put my finger on it, but it goes beyond a typical episode. Maybe it's Arthur's dad's terrifying recipes... he's usually a decent cook.
It was an interesting (not necessarily good) idea, but it's really let down by how cheaply made it is. I don't know how many episodes were done, though I doubt very many were eventually made. The cited website doesn't seem to offer the Arthur DVD anymore, so I presume the offer has been discontinued. Maybe young kids would have liked it, but I think they could have done better.