Cool idea about putting money in the MP soap. I don't even think you'd need to put it into a plastic container first. I've laundered so many dollar bills, I can attest to their hardy response to a washer and dryer. Well, that's my experience anyway.
The thought makes me want to try it.
Zany, have you seen any cute car or truck molds? It's hard to find molds with shapes boys would favor, but cars and trucks molds are available. So are some molds for some sports teams, but they're a bit harder to find and pretty darn specific. Also I've seen generic sports theme molds for basketballs, soccer balls, footballs, etc. They always seem to be pretty small, more for candies or cupcake types of molds. And sometimes ice-cube molds of the same genre. But
WSP has a couple at least and so does
BrambleBerry at least in one of their kits.
But the Baseball soap mold is one I am considering for my brothers. We go to Spring Training in AZ every March, so a baseball theme is quite appropriate in our family.
I ran into molds for ice cubes for some state ball teams now and then, in fact have one for the neighboring state. Still haven't seen one for the state where I live, but I haven't looked extensively either.