straight from the shower

Sometimes I get ideas while taking my morning shower. Here's what popped into my head today.

• A day or two ago some blogger proposed using your raw Dex score as your Ascending Armor Class.  Please leave a link in the comments if you know who I am talking about.  What if we combined that with Damage Reduction armor that lowers your Dex?  Maybe Leather is -1 Dex/-1d4 damage per hit, Chain -3 Dex/-1d6 damage, Plate -5 Dex/-1d8 damage.  Shield users would maybe get a Deflection Save, like a d6 roll. 1 = no damage, 2 = half damage, 3+ no help.
• I wonder if all the best parts of the cool alt-classes in Monte Cook's Arcana Unearthed/Arcana Evolved could be rewritten as simple templates applicable to basic D&D classes (like my Paladin and Druid)?  You just lay Warmain over the fighter class, Witches and Runethanes over magic-user, etc.
• If I recall correctly in the Elric stories some demons have gemstones in their hearts. What if that was the source of all gems?  Maybe the world is the heart of a cosmic-scale demon.  Or maybe gemstone mines dig into the corpses of fossilized demons.