Please share. I'm not too sure of what a choice board is (I think I have an idea from the name but I could be wrong). I usually just have them choose from any of the ways that we know we can communicate ideas to those who are not necessarily in front of us. (Although we also go on actual trips to the middle school and elementary school to work with the kids on character ed.)
After the younger students view the older student's projects, I'm thinking they could create storyboards or some kind of animated strip to share what they understood.
To find the quote they will search the Internet. Every year, I have students do this in the beginning year as an introduction. Once they have chosen a quote, that will share it with a small group to practice interpreting the quote, explaining why they selected it and what it means to them. Then, they have to come up with a way to communicate their interpretation of the quote to a larger audience (in this case, the students in the elementary school). By this time, I would have done a mini lesson on a few ways they could possibly do it: blog, video, podcast, Skype. Etc Throughout the year, they will complete several projects similar to this one so jumping right in with a lesson on character would be a great way to begin.