An interstitial often appears between different shows to make up usually 1-3 minutes of spots. I have seen some in Kid's television channels. Some of them have narratives and some don't. What is so attractive about the interstital pieces to me is that as a producer, I'm able to express what I want the audience to catch very briefly.
Rupert The Grouper (Cartoon Network)
Nuttin But Stringz - Thunder (Noggin)
Upside Down Show - They teach how to juggle in this episode (Noggin)