This is by far one of the best world seeds I've found. I just generated my minecraft world, and spawned in a giant jungle. I didn't think there was anything special about this world until I saw the hills. Mountains in the jungle. I thought that was pretty cool. There's also many caves.
Another amazing thing about this seed is that in the nearby desert, there's an exposed dungeon. I dug around and found some treasure. I had already found diamonds, so the treasure was a bit...shortcoming.
In the desert there is the biggest slab of exposed stone I've ever seen. So big I thought it was a small mushroom biome when I saw it on the map.
Follow the river near spawn and you'll come across a huge canyon with exposed minerals and lava.
This is an overall great seed and I hope someone will enjoy it. The seed is: 265598288.