@Moridin sadly, I don't have access to, nor have I ever used either an english wheel or a planishing hammer. I'm might grab a bead roller, though my worry is the thickness I am making the pots would necessitate one heck of a tough roller. Stainless does have a tendency to move as it wants when being formed more than steel does. I'm toying with the idea of forging in some radiused sides on some round pots, but we shall see how much time I am able to find for pot making.
@Lutonian right now I'm just running a few more in plain old steel before I pick up corten. The torch idea isn't a bad one. There are some blacksmithing finishes that might be cool and only use beeswax and heat to achieve which should be safe to trees and might be way cool. It's a similar finish to cast iron.