Number four could be used to accomplish number one.1st off your daughter is awesome. I love it when my daughter takes interest in my hobbies.
Depending on the size, thickness and our haunt here are a few ideas:
1) Ghost writing (have words show up without anyone holding the marker. Not sure how I would do it, but it would look cool)
2) Drill holes in it and make it part of a vacuum form table
3) Make part of a back drop or use it as sub-straight
4) Show a projection on it.
Or just keep it simple and just make a mural on it.
The important thing to remember is your daughter thought of you. She might have an idea what to use it for.