I wouldn't, as some servers say that they will ban you if you use cheats.
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Yogscast_painterly
You download a texture pack, drag it into your texture pack folder, and then select it through Minecraft.
In minecraft survival you can just take any land but in servers you might have to use commands.
You can,t dumbo
It really depends on the server. In some Minecraft servers you can use duplication methods to gain unobtainable items (if bones or bonemeal really is an unobtainable item) while others either don't have any or you have to collect them yourself by killing skeletons.