I love these “Twig Terrariums” (truth is, I love all things in miniature).
You can buy a complete, finished twig terrarium or a DIY kit to make your own. If you live in NYC you can sign up for one of their “how to make a terrarium” classes.
And methinks the crafty types could just run out to Jo-Ann’s, grab some supplies and do it on their own. This might actually be a fun summertime kid project too.