Soap carving with popsicle stick knives--did this when I was a leader, so much less stress! We just glued 1 stick in between 2 halves and let them sharpen it, which also passed off one of the Bear requirements for Whittling Chip.
Establishing your pocketknife blood circle is about knowing how far from living beings you must be. If a person, pet, etc. enters the established "blood circle", the knife should be closed until it is once again clear.