I've been at this longer than most of the members. In my early days, I did a lot of experimentation. Off the top of my head, in addition to the base oils already mentioned...
Sunflower Oil
Grape Seed Oil
Carrot (infuse in oil)
Lettuce (infuse in oil)
Tomato (infuse in oil)
Beet juice
Cucumber
Parsley, fresh & dried
Lemon & orange - juice & rind
Realemon Juice
Potato (water for lye solution)
Rice (water for lye solution)
Pasta (water for lye solution)
Teas: Green, chamomile, rooibos
Coffee, Instant coffee, Espresso powder
Honey, Molasses, Maple Syrup
Oat flour, Barley flour, Rice flour
Oatmeal, corn starch, baking soda
Sea Salt
Spices: Cinnamon, clove, paprika, bay leaves
Apple Cider Vinegar
Beer & wine
Castor oil
Aloe juice & gel
Vitamin E capsules (antioxidant)
Bera Carotene capsules (colorant)
Frozen Blueberries (juice for colorant)
Baby food - carrot, spinach (colorant)
Crayola Crayons (colorant)
Egg
Dairy & Non-dairy milk, cream, yogurt
Powdered milk, buttermilk, goat milk
Carnation Condensed Milk
Meyenberg canned goat milk
Dried sea weed
Pringles (mold)
1 lb. lard box (mold)
Cupcake//muffin liners (mold)
Milk/OJ cartons (mold)
Nancy's Mini Quiche (multi-cavity mold)