Can the museum items added by completing a childhood aspiration be something the child creates AND something like crystals or JUST what the child created but ten of them instead of eight?
It can be something the child creates OR something you collect later on in the heir's life. Since museum item needs to be unique type, you have to contribute 8 or 10 of the same unique type, cannot be mix or match.
Examples:
If your child heir completes childhood aspiration, he can donate 10 Kid's Drawings (from creativity skill)
If your child heir DID NOT complete childhood aspiration, he can donate 8 Kid's Drawings (from creativity skill)
If your child heir completes childhood aspiration, he can donate 10 crystals (from collecting)
If your child heir DID NOT complete childhood aspiration, he can donate 8 crystals (from collecting).