As a design project for school?

Generally multipurpose or universal stuff doesn't do anything particularly well. Why not throw in a "wildcard" feature of your own choosing to stand out in the crowd.

Examples:
hammock
tent
potted/vased flower carrier
etc.

The challenge is to think the execution through, not necessarily re-invent the obvious.

...another thought, pick a unique material as the spotlight, how about incorporate a white-board for impromptu think-tank sessions?

these are all silly of course, but process and workflow are skills in themselves and worthy of mastering.