pumpkin bars

I just made these pumpkin pie bars, and they're yummy! http://thewilsondiner.blogspot.com/2009/09/pumpkin-pie-bars.html
I just subbed out the dairy, but i think it'd work fairly well to change any of the ingredients. here are some ideas:
wheat flour - most any type of non-wheat (oat, millit...) flour should work for this
oats - could use more flour instead
butter - any type of oil or margarine
pumpkin - any type of cooked squash
evaporated milk - 4 1/2 tsp. dairifree mixed with 1 c. warm water and soy or rice milk to make 1 1/2 cups
eggs - Ener-G egg replacer or flax goo (ground flax seed mixed with warm water)
pecans - oats or maybe cereal or seeds, maybe chopped pumpkin seeds