You can convert it to propane. There are rectangular (including square) fire pit inserts available, you just put fire (lava) rocks on top and you have your a small enough fire pit not to cause damage to nearby structures or overhangs. Just use common sense in any case about how large a fire you put in it. Technically, bricks, pavers, and rocks need to be specified for fire. I've used decorative rocks that weren't meant for a fire pit and they crack. They were even put in by professionals, they knew they might crack but weren't worried about the fire danger. Rocks and pavers can crack under heat but won't catch on fire.