I didn't do anything special with him, no conversion work, no special painting techniques. He'll have a nice spot on the display shelf along with the other barbarians.
I still love the old Confrontation figures. They have lots of detail, but the detail is usually well-defined and easy to paint; there's just a lot of it, and it can get a little overwhelming if you have a lot of figures to paint. I don't know where I got the energy to do three different armies (for other friends) when the game was ascending.