This seems like a good idea, but in order for that to happen somebody must make a challenge plugin. By the looks of it, nobody has made the plugin...
While that would fall under the category of decoration, it does sound like a fun idea :)
Good question. It could be used for decoration (though it will probably melt). Also, if something goes wrong with the creation of an infinite...
If you have been on the .org server, you would know that there is an island at the spawn that contains some cobblestone generator examples....
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