A blood smear following your hand down the wall with selective color on the monochrome shot would have been fantastic, but none the less, I like it!
I'm seeing a pattern here. Maybe I have a thing for blood? Hmpf...oh well.
Corn syrup with red and a little blue food coloring (to darken) works great and washes off with warm soapy water on a wash rag. Even comes out of white clothes in the wash! =]