Some issues that need to be considered:

1.	Infectious risk
2.	If fixed, do you hand them over in formalin ( a poison) or alcohol 
(?worse)

If a child gets hold of the container and drinks the solution what 
would the effect on the child be?

I think I would dispose of them.

Maybe for a price you could embed them in glycol methacrylate and 
give them a sealed, mounted block - like a trophy for surviving 
hospital food!!!

 Regards Tony
Tony Henwood
www2.one.net.au/~henwood