You can 'smelt' it to create the dye, 'cactus green'. Or you can plant a block on sand to make more grow, which can make more dye, or be used as part of a trap, as it hurts mobs.
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Burn cactus in a furnace.
Green:Cook cactus in the furnace to produce "Cactus green".Lime green:Combine cactus green with bonemeal to get lime dye.See the related link below for the official Minecraft crafting guide.
Destroy cactus blocks in desert biomes and then plant it on sand.An it will grow.
The hardest block in Minecraft is bedrock. It is completely unbreakable unless on creative mode.
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