I find gravel to be incredibly, incredibly useful. Since it falls if there's nothing underneath it, it's easy to suffocate enemies and drop on lava (if no bucket of water is handy), and makes it ideal for use for the pillar-jumping trick since the pillar is easy to remove if you fall off it by accident. Plus mobs don't spawn on it, so it's good for laying mine cart track ontop of. And you get flint from it too. :P
Sand is just as useful and looks nicer but you don't really find it underground.
|