This picture reminds me of a glass mason jar that my grandfather had, filled with marbles. I love marbles. I like the coolness of them. I like the smoothness of them. I like the colors of them. There are few things I think are prettier piled up in a jar.
My grandfather also taught me how to shoot marbles. I taught my Cub Scout den how to play--in the hopes of keeping alive a game that had nothing to do with television or gameboys. I also won the adult division of our Cub Scout Pack's marble tournament. And no, we didn't play for keepsies.
Teach your kids how to play. Need to know how yourself? Go here and learn. Then get down on the ground and PLAY!
Marbles are also cool things to collect, if you haunt flea markets and such places. It's a great collection for a kid, because each individual piece need only cost a dime or so--until they get hooked and want the expensive marbles! And you only need a glass jar to display them in, though there are fancy display cases available (see the link in the paragraph above). What could be easier?