Polenta instead of cornmeal works perfectly Kaz. I've made birdie bread for my flock using that.
This was the recipe i used:
1/2c wholemeal flour
1/4c polenta
1/4c crushed pellets and/or seed
1 whole egg
pinch of baking powder (optional)
1/2c water or fresh fruit juice (i.e. homemade)
1c chopped/grated veggies, fruit, nuts, etc (try to squeeze off as much of the liquid from the veggies and fruit as you can)
It looked exactly the same as Ravengypsy's does in the pics but more vegetable-y.