Previous blog: http://www.thefreshloaf.com/node/22542/noknead-multigrain-seed-and-nut-loaf 
I know that most of us, that culture wild yeast, seldom actually "discard" the discards of our sourdough. Of course, it is not unusual to hear someone new to keeping a sourdough culture remarking that they hate to have to through out the discards. And again, of course, a dozen replies of "No! Make pancakes..." or "Oh, no! Make waffles... ". Well, from now on, I will be crying "No! Make sourdough crackers.. The older the discards, the better the crackers!"
Naturally, that does assume you like sour sourdough, but the crackers are great even with "un-sour" sourdough discards, Rye Sour, etc. or even non-discarded levain as the leavening ingredient.
I came across a year old post by Sarah Wood on using your discard for whole wheat crackers. The link is:
It certainly looked simple enough, so I tried it. I am certainly glad I did, although, a batch never last very long and another few hundred calories have been ingested.
So, here is a step by step, complete with photos, Baker's percentages, some suggestions, and pointers on the ingredients and process. Even if you are not of an experimental curiosity by nature, I suspect you will have some ideas for variations you would like to try.
A small amount Sesame Oil, or Olive Oil to brush the top of the crackers and Kosher salt to sprinkle over the oiled surface will also be needed.
Substitutions of butter or lard can be made for the coconut oil, but I prefer the coconut oil, either the Extra Virgin, or the Expeller types.
Notice that I chose the ingredient amounts to exactly match the Baker's percentages. This batch size works very well for one sheet of crackers per Silpat baking sheet and a 100 grams of discards is an equally reasonable size. If you wish, make multiples of this amount and store in the fridge until you want more crackers.
I do want to mention some considerations to keep in mind when using coconut oil. Using the Extra Virgin Coconut Oil is my first choice, Expeller Coconut Oil is my second and neither one requires special consideration in a warmer kitchen, but if the kitchen temperature, or the dough temperature, is below about 78ºF ( 25.5º C) then you should either use methods to maintain the temperature of all ingredients about 78ºF ( 25.5º C) during the mixing phase, or use softened butter. Coconut oil is liquid from about the 75ºF ( 23.9º C) and above. Adding it in a mix of cold, fresh out of the fridge, levain may very well cause lumpy, difficult dough conditions. Once the full mixing is complete, this is no longer of any potential problem.
Let your finished crackers cool before placing (if any are uneaten) in an airtight container to preserve their crispness.