Here is the grid spot I made just before "Metalpam" posted her tutorial link.
grid spot attached to SB-600
Shot of drinking straw grid. made from a cereal box, black straws and black duct tape.
Assembling the grid. I taped together 5 rows of 9 straws each (each straw was cut to 4"). They easily slip in and out so I can use the body as a snoot (minus the grid).
Had I seen MetalPam's tutorial I would not have bought a box of 400 billion black straws (actually only 400). Either way these can add some creativity to your portrait shots. Have fun.