O and I recently made this rolling toy for E, and she really likes it! We put a marble, bell, pom poms, and pipe cleaners into an empty Coke bottle (2 liter), and we shake it and roll it around on the floor for E. O loves to make things for her baby sister.
Here is a rattle that O made for E for Christmas. It's a plastic test tube that she filled with beads and pom poms. I bought the test tubes after Halloween (they had nasty gooey candy in them.) She made several test tube rattles...one has bells in it and another has small balls in it. We're also planning on making a few discovery bottles for E to enjoy!