Sounds interesting! I don't know of any recipes, personally. Something to keep in mind: the "skins" on pecans and walnuts are full of tannins, which might have a negative impact on the flavor of your beer.
I would still love to hear the results if you end up finding a recipe.
"Give a man a beer, he'll drink for the day.Teach a man to brew, he'll be drunk the rest of his life." -Anonymous