Yes of course. When I teach my cooking classes I tell students not to worry and experiment as much as they want, the proportion is 2/3 cup of dry_________ (insert your own fibrous ingredient here)to two medium eggs.
Things I like to add:
chickpea flour
flaxmeal
wheat bran
macadamia meal
cashew meal
oat flour
amaranth popcorn
pumpkin seed flour
sesame flour
apple flour
For the sweeter versions I add dried coconut often
Love the taste.