If you wish to make these without coffee, substitute 1/4 teaspoon of ground cinnamon and 1/4 teaspoon ground cardamom for another layer of flavor. (faring-well.com)
It's also lovely with extra spices in there - try 1 tsp of ground cardamom and a pinch of nutmeg. (nourisheveryday.com)
I added ground cardamom to the batch, but keep in mind that cardamom has a very distinctive taste, that's not very subtle. (theindigokitchen.com)