Carboard Room Dividers

This modular system from Nomad lets you construct a wall divider, partition, or a complete room out of simple cardboard components. Each individual component looks like this:
You put two of them together to make this:

And then stack those together to make this:

At $56 for a set of 24 "modules" though, they're not cheap. But the concept seems simple enough that you could make them yourself out of enough cardboard boxes and some paint. Or maybe cardboard boxes covered with leftover magazines and decoupage glue. Any suitably sturdy building material will do.