Heat a dry saucepan over medium heat. Add the millet and cook 2-3 minutes, or until toasted and fragrant. Transfer to a dish. Return the pan to the stove. Add the brown sugar, brown rice syrup, and butter. Cook 1-2 minutes, or until thick and bubbling. Remove from heat and stir in the toasted millet and graham cracker crumbs; mix well. Press into a shallow dish and let cool several minutes. Crumble into bite sized clusters.