Okay, so, playing a voodan, I -love- the gris-gris feature. It's pretty fun to play with. But I notice that more then often, people forget to use it, or do but the gris-gris's inert before they remember. And the constant trade window exchanging can get old fast....
So I would propose a small change to Gris-Gris (if possible that is) : That Gris-gris can applied by someone to another, regardless of the spell.
For example, that I can apply a Divine Favor Gris-gris to Jean-Michel the Rogue myself, for example, instead of having to hand them over to him. I'd still have to make a gris-gris, of course!