No offense, but I think for building purposes, cobblestone is just about worthless, and kind of ugly. That's just my opinion. For looks, I like Iron blocks, and for building, either wooden planks or stone brick (both of which are very unique XD).
Take a look at the cobblestone. you can make an amazing castle with it and you can make a generator of it. you can also use it to make a roof.
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"I'm right next to your house waiting for a creeper to blow it up"