This existential absence gnawed at my brrrrraiiinnnnsssss and left me cold. That is, until it finally hit me like a shuriken. The original shadow cast was missing totally awesome ninjas. I corrected this problem and then wailed on my guitar.
If you happen to have access to a laser cutter, a friend with access to a laser cutter or internet access and a credit card (ahem... ponoko.com), then you can make your own today!
Step 1: Go get stuff
The attached source file
6" x 20" sheet of 1/4" plywood
A laser cutter
Step 2: Cut it out
I happened to be using an awesome 75W Epilog laser cutter with the following settings:
Step 3: Glue and clamp
Evenly sandwich that piece together with the solid U-Shaped piece and clamp them until dry (roughly 30 minutes).
Remove the clamps and apply glue evenly along the short flat edge of the new composite U-shaped piece (this is the edge opposite the curve). Clamp this at a right angle with the "Ninja vs Zombie" cutout.