No, it wasn't a video (I shun videos), but I'm reading through /r/Tulpas and apparently they acknowledge it's a really common thing for tulpa-enthusiasts ('tulpists'? is there a word for them yet?) to make ponies: http://www.reddit.com/r/Tulpas/comments/14zbli/the_internet_is_laughing_at_us_and_you_shouldnt/c7hy6mk So I guess it could have been any of a lot of people.
EDIT: I find the religious connection very interesting since it reminds me of the Christian practices I've read about before, so I've asked them about it: http://www.reddit.com/r/Tulpas/commen...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.