Put on safety goggles. Mix a small quantity of red latex and black paint, paint the mixture onto a smooth, hard surface and allow it to dry. Repeat, altering the proportions of paint to latex until you achieve the desired color.
Paint four or five layers of liquid latex onto the surface, allowing each layer to dry before you paint on the next one.
Twist a sheet of newspaper into a tight, uneven "rope" about a quarter-inch wide. Lay the newspaper rope along the edge of the latex. Roll it, lifting the latex as you go and letting it adhere to itself to form a tight tube around the newspaper rope. When the tube is as thick as desired, slice along the latex to separate it. Repeat to create as many "intestines" as desired.