I would love to get bottles like these here, smash them and put them in a rock tumbler, then scatter them along the beach for my niece to find. I would pretend that they really came in from the lake. She’d flip. :)
I would be all over making jewelry out of them. Though they probably don’t have holes to string through, you can secure them by wrapping them in wire like this (those wrapped balls at the bottom are marbles).
@Jude I collect it too.
I usually just keep it in an antique clear glass jar and put the jar in a sunny window. The light shining on it and through it is very nice. @YoBob ‘s link has some great ideas.