My best brooder was an old kiddie pool that we used for the dogs in the summer. I added a wall of cardboard boxes around the outside like a ring---fastened with duct tape and also with some furniture pushed up against the cardboard to keep it in place. Had to be careful that there was no gap that a chick could get wedged between the kiddie pool lip and the cardboard ring.
The cardboard ring was to add height since those little buggers could jump amazingly high (should've known then that they'd grow to become hens who fly out of their run every day!)
I did sawdust in the bottom and scooped out soiled places as needed. Very easy to take the pool outside and hose it down when finished with it.
I'd be leary about just using a cardboard box by itself because the bottom will get soaked very quickly. My chicks constantly spilled their waterer no matter how many variations I tried and they poop like crazy. Even if you put a tarp under the box to protect your floor the bottom of the cardboard will be a nasty, soggy mess in less than a week.
Edited by Daisy8s - 3/5/12 at 8:55am