Several months ago, I experimented with a 100% Whole Food, Frugal All Purpose Flour with pretty awesome results! I wanted to create this mix from whole foods (not tapioca and other starches) for two reasons. One, because whole foods are better for you and two, it can be VERY pricey to purchase several varieties of gluten free products to create your own mixes.
Here is the link to the All Purpose Mix. I used my Vita-Mix, but you can use a $20 coffee grinder instead!