This is a good roundup of 13 DIY edible and inedible fake blood recipes.
- Simple Red blood (edible)
- Chocolate blood (edible)
- Gelatinous blood (edible)
- Peanut butter blood (edible)
- Congealed barbecue sauce blood (edible)
- Tomato blood (edible)
- Soy sauce blood splatter (edible)
- Kool Aid blood (eating not recommended)
- Beetroot blood (edible)
- Movie blood for splatter and smear (inedible)
- Artist supply blood (inedible)
- Maple syrup blood (edible)
- Chocolate Syrup and Coffee blood
For a post on 8 Fake Blood Recipes from about.com go here. Spray Bottle Blood, Dark Thin Blood, Thick Realistic Blood, Gross Blood, Fake Flesh, Dripping Blood, Scabs and Prop Guts
Source: wikihow.com