Grease two loaf pans.
Mix together flax seeds and warm water.
Add sugar, oil, applesauce, and vanilla; beat well.
Add grated zucchini; stir til combined.
In a separate bowl, sift together remaining dry ingredients.
Add dry mixture to wet and stir just until dry ingredients are moistened and everything is incorporated evenly; some lumps are fine. If adding additional mix-ins, fold them in now. Divide batter between prepared pans.
Bake at 350 for 50-55 minutes, or until knife inserted in center of loaf comes out clean. Let cool a few minutes before slicing.