I've updated most of my own textures to 1.13, and some of them to 1.14. They are also based of off Painterly, but there are a lot of new items, so it's taking quite a while. I also have no idea how to go about updating to the new horse models.
Cool stuff! One of the hardest things about updating is letting go of old texture packs. Especially since my all time favorite was a custom combination of painterly with resources nicked from my favorite custom maps.
Sad to hear this is now discontinued. I'd love to help continue it, however I don't think I have the skills to be able to make them in the same style! >.<
Oh well, I'll keep watch of this thread to see if anyone takes over to continue it.
@GerbilCrab475, man you can't get my hopes up like that!