How can one make centerpieces out of eco friendly glass?

My child has to make something interesting with eco friendly glass. Now the ideas I got were that he could make a mural out of the eco friendly glass. Another idea I thought of was covering eco friendly glass with jute rope and then making wall hangings out of them. My sister told me to find out how to make centerpieces out of the eco friendly glass. Do you have any ideas or should I stick to what I thought of?