Each card is made by one of the kids so that they all contribute to the overall timeline.
In Word, I created a 2-column 4x6 paper, with 1/2" margins. On one column I place the picture, chosen by the child, from Google Images (though pre-printed characters, such as those from Homeschool In the Woods, would work well, too). One the other column, I type what the child tells me about the historical event.
So many companies offer a great variety for the use of timelines. And so many creative moms have made exceptional uses of wall space and notebooks. I'll post a few other links as soon as I remember where I saved them. But please share what your doing (or what you'd like to do) with your kids in you schoolroom. :)