I found this toy idea somewhere but I can't find the website anymore. My rabbit really enjoys these treats so I made a quick photo tutorial.
http://imgur.com/a/W2DEl#0
Sorry if this is already somewhere on the site, just thought I'd share. My rabbit loves these and she's gotten really efficient at destroying them. They're a really quick treat you can put together in just a couple of minutes. Makes treats a little more interesting.