Our little one's needed a little help understanding "Christ in you" and so we built a little (okay, huge) visual for them. We printed off a bunch of fruit shaped stickers that have each fruit of the Spirit printed on them. Then we sat back and tried to watch for when they were behaving in a way that expressed that particular fruit, and then gave them the matching sticker so they could place it on the tree. They are loving it! Eventually we'll have to take the tree down, but for now it's working well.
Maybe we'll transfer it to their bedroom when it's full, so they can look at it...or maybe downstairs in the playroom??