Ive been wondering if notch would put in volcanoes, lava starts spewing out of the volcano and if it hits water it turns into cobble or obsidian, or anything else notch would add in, more minerals? rocks? you could also explore the volcano inside, sort of like an cave, just watch out for the lava. this is my first suggestion, tell me what you guys think
*on topic*
Suggested already. Google works. Go use it.