Wait, dont through that old pool liner away and that old rusty fire pit either!
Second up is the old pool liner, I just put it down over the existing grass and filled the top with some red mulch, I still need to do the edges with decorative blocking. It seems to stay in place fine through all our daily storms and ironically enough this is where my new fire pit is. I guess its all connected. So don't be hasty about throwing things away , find an out of the way place and store them until you are ready to repurpose them.