Thought this was pretty amazing given that I seem more interested in minecraft terrain more than anything. I came across this video and tried some of the seeds that were linked in singleplayer and popped into spectator mode and was absolutely amazed.
They provide a few seeds in the video as well as in the description and in comments also. I tried seed 164311266871034 in an amplified world and was pretty wild. I don't think it makes much difference above ground so if you give it a shot make sure you go spectator and have a look below!!!
Hope you enjoy it!!