In The Nether - As the name states it has something to do with the nether, the nether in this seed has a quite big open area and has some caves

Jurassic Pork - This world has a large desert area with a few lakes and ponds , it also has a few mountains and caves, one of them lead to redstone

666 - This world has groups of mountains throughout the land with a lot of overhangs and caves, there is also a large desert too

Sosaria - In this seed you will find a lot of mountains with caves at the base of them, even found a cave that led straight to diamonds

lucie - Another seed with mainly water, it has a few small islands and pretty much no trees, but there are a few mushroom bi-omes

Maxwell - This world has mostly water with a few islands, on the islands you will find mushrooms bi omes and even a mooshroom!

notrees - This seed has to vast plains, one being a grassy plain with no trees and the other a sand plain. On the other side of the map you will find a snowy forest area

Porkaxe - This seed has a lot of mountains some with surface caves, there are also a lot of villages in this one and you also spawn near a lava pool

gargamel - This seed is awesome, tons of mountains,tons of cave systems due to the mountains you will find surface iron, maybe even gold....

worstseedever - Not a bad seed at all due too the vast amount of diamonds and gold plus a huge cave system to explore

The Best Seed - This seed really doesn't live up to its name, all there is here is a few small islands of green, hardly any trees at all and lots and lots of water...Sigh

beagle bagle - This code has a long of cliffs and forest areas with some cliffs having massive overhangs