This is a horn I made a good while ago for myself. It's very simple and only has a small "tribal" swirl on it's tip. I've used this many times and keep it close by :D
I'm still open for custom functional drinking horns, Note me for more info on that if you'd like.
Original craft works by Yoik
Link
Drakenhart
What is required to make a horn usable to drink out of? I'm curious as I'm part of the SCA, and I've seen these used by different people. :)