Had a go at making a wooden mug yesterday evening, just used plain birch, there were a few small burrs but unfortunately I had to cut them away. It's still green so will leave it to season for a while and then sand. Only have a hoof knife so hollowing out was a bit time consuming but got there in the end.
Here we go, http://www.flickr.com/photos/80226784@N07/7362843576/
Here we go, http://www.flickr.com/photos/80226784@N07/7362843576/