I found myself with 2 5lb bags of flour last night, both with bugs! I gave up a long time ago on these, my house was infested with them for years before I was around. I compromised by keeping all my grains and anything else they might like in the freezer. But I have only so much room, and when we shop only once a month it gets a little crowded.
I was making these delicious curry basil falafel, and couldn't find anything to use to substitute. I tried a little breadcrumbs but they were still not cooking well so I finally added some ground oats.
Its very easy to make most of the basic gluten free flours. I find them way too expensive and when used in most dishes the home made is an excellent cheaper substitute with the added plus of not having to fill my freeze with 5 different flours.
Basically you just thrown the cup of whatever you need in the blender....and don't forget the throwing part lol. When I used almondsin baking I simply grind them first then add most of the ingredients right into the blender. They grind up surprisingly well in my 3rd hand 10 year blender which is outlasting my Vitamix! Yes we killed our Vitamix, like everything else in the house. Luckily Costco has a lifetime warranty on their products, so my husband took it back.
So to make oat flour you throw it just the same way, I find 1 cup at a time works perfectly. If you need to see formatted instructions, wiki seems to have everything these days. The only further comment I would make is that you may find you need a little extra moisture with some of these flours, maybe an extra egg, or I tend to use ground flax mostly.
And I just realized I have wheat berries in my frig, which I obviously haven't used for a very long time. If you don't have a problem with gluten and not substituting for health purposes, adding different flours to your cooking will add extra nutrients and in some cases cut down on the carbs and calories.
How to make flour
How to make rice flour
How to make oat flour
How to make coconut flour
All purpose gluten free flour
In case you require some specific flours for baking these are the basic recipes for baking flours you could adapt.
How to make cake flour
How to make self raising flour
In case you're interested my very old still working blender is an Oster. Gosh it's on sale for $34.99 right now, maybe I should buy myself a new one :)))
For a great list of gluten free flours and the best flours to use as substitutes wheat-free.org has a wonderful list right here!