A laptop or tablet version? with a flex screen
Could be a cardboard with a flex screen. pretty nice to show off around
Making a cardboard case for a mobile computer is asking for someone to take it out in the rain. While it's an excellent goal, to design such a case from sustainable materials, a designer would have to look further to find a material that could provide sufficient protection for a laptop.
I don't think cardboard would be durable enough for the kind of use a laptop gets (as opposed to a desktop which basically sits still the whole time with only minor touching). However, a more sustainable laptop case (one durable for 5 years or more, but still disposable or easily recyclable) would be pretty cool.