I've fallen in love with the seed mix DonD used in his Pain aux Cereales. blog here The millet really stays really crunchy. For a twist, I added a bit of caraway too. I recommend it highly.
I regularly make Pita Bread with seed topping. Really makes a nice addtion.
I use a mix of sesame seeds, golden flax seeds, and sunflower seeds. Brush the loaf with water using a pastry brush and spinkle on the seeds just before popping into the oven.
What beautiful loaves! I often use sesame seeds, flax seeds, or pumpkin seeds as a topping but hadn't thought to combine them. I really like the idea of using millet on top as well.
Oatmeal works really well too.