If you're gonna do it, do it right. You need to put down 4" of crushed stone or similar, tamp it down real good, and use edging to keep the bricks in place. It's like guyod says, if not done properly you'll end up with a tripping hazard in a couple of years. If you're not into doing that much work, it would be better to find another use for the bricks. Maybe a brick cookout grill?
If you just want to get rid of the bricks, you could sell them on www.CraigsList.com
. Just trying to be helpful. A walk way is not a project to do half way. Just think 'potential law suit'