The clay ones go way back. Some of them are said to have been used by the early American Indians. Along with the clay marbles, there are agates, china, handpainted, swirls, benningtons, and lots of others. I like that orange and black marble below. Looks like Halloween colors!
The jars they are displayed in are neat, too. I love the vintage Tom's Peanut Jars, Stewarts, a Squirrel brand Peanut Jar, and lots of old Mason jars. There's about 25 jars in all.