There are many possible enclosures to keep chicks in. All have certain advantages, and disadvantages:
 
Cardboard boxes: Pros: Inexpensive, tall walls keep drafts out, disposable, bottom isn't very slippery. Cons: slight fire hazard, bottom may be destroyed by chicks or soaked by spilled water.
 
Wooden boxes: Pros: durable, warm, easy to make, non-slippery floor. Cons: hard to disinfect, heavy.
 
Plastic tubs with holes drilled for ventilation: Pros: Inexpensive, easy to clean/disinfect, lightweight, durable. Cons: slippery floor, needs a wire top and plenty of ventilation to prevent moisture build-up.
 
I've used the plastic tubs for brooders before, and they have worked well. Whatever brooder you choose, make sure it has high enough walls to prevent escape, or a wire cover, and put a thick layer of bedding in it. Pay attention to the location of the heat lamp, too--you don't want to accidentally start a fire.