Or could I do something cheaper like pad the hearth up with a sheet or something? I've got a Victorian fireplace with a tiled hearth with frighteningly sharp edges and an open grate just asking for my son to climb into it/bump his head on it.
Obviously we're not going to be burning anything in it for a while (well, at least I hope so but the way this summer's going who knows!) it's just the sharp bits that bother me. Any thoughts?