I made this just for fun. I was sort of inspired by the beginning animation from the Hannibal tv show.
Just hold down the mouse button anywhere on the right side of the screen. You can change the direction and thickness of the blood. Right clicking will freeze the movement and clicking on the camera will save a picture (you don't have to freeze to do this). Left click anywhere to unfreeze.
Only works with webgl. I just use the alpha clamp and lense effects.