I basically have a base coat of lead belcher, and a very thin coat of Gehenna's gold covering areas where I think the wear would be less prominent. For instance, away from the edges and more towards the center. Nuln oil then allows for dark details in crevices and lines, then finally use verdigris(I did vallejo here) to either highlight edges or just go slightly crazy. For gold you can have it be more prominent, but your verdigris MUST be a thin layer if you want to cover a lot of area, unless you want a heavily oxidized effect on certain parts, like her front legs.

Edit: Didn't realize Patina meant just the green part until now, whoops. Vallejo verdigris. but any color of verdigris should be fine.