I had this idea too a few months ago. I had looked at lenticular sheets and other things but stopped thinking about it eventually, not sure why. (except for the fact that is what I usually do: I have an idea, think about it for a little bit, look at how it could be done and stop there :))

I think it was a combination of the price of the individual sheets (on Amazon at least) and the need for a high quality printer and assembly (the print and the lenticular sheet need to be perfectly aligned). I was imagining a cheap service to get memes into magnets for your fridge but the prices seemed not to match this vision. Working with artists like this site is doing is definitely a great idea. I had started trying to find a local printer but I don't think I found anybody fast enough for me not to move on to a different idea.

Great work!