Tonight I'm making tubtime crayons...
1c grated bar soap
1/4c warm water
cookie cutters/ice cube trays
Mix the soap, warm water and food colouring together until dough like. Either fill cookie cutters or ice cube trays with mixture. Freeze until firm, but not brittle. Allow to further air dry until hard. Can also be used as bath soap.
I'm looking forward to the kids trying these out tomorrow night. They came out a bit bumpy - I think the soap needed to melt a bit more.