When I have to take away a student's cell phone, it goes in to my Handy Haus for the rest of the class period. My original Handy Haus was just a basket with a label on it.
This worked just fine, but this summer I decided I wanted to upgrade. I found a cardboard house with a removable roof for just $3 and knew I had found my new Handy Haus. It was plain brown, but my kids offered to paint it yesterday, and I happily took them up on the offer.
Here they are, planning the color scheme:
The finished product: