This article is from the Baby Proofing FAQ, by Sandra Smith, firstname.lastname@example.org with numerous contributions by others.
From: Laurie Hafner <email@example.com>
We purchased 6 bedsize pillows (inexpensive ones) and my husband's
grandmother made covers for them to match the colors in our living
room. We prop the pillows up against the fireplace. They have
provided an excellent barrier to the bricks. We have not had any
accidents so far - thank goodness. We have a 28 mo old and a 14 mo old
- both boys who are very rough and tumble with each other. When we use
the fireplace, we remove the pillows and are always right there to make
sure they don't get burned or bumped.