I discovered a seed that might interest anyone who enjoys mountains and tundra. The seed is:
It is caps sensitive, so be careful of that. The seed is set to Large Biomes. The numerical seed is -989783316. You spawn at 0,0.
This seed has the following features:
-Huge Tundra biome, covers a good portion of the map, which I intentionally did not explore all of, plenty of things for you to discover.
-Titanic mountains, lots of floating islands, and plenty of large cave entrances, all covered in snow.
-Trees dot the landscape, there are pumpkins right next to spawn, and there is sugarcane around.
-A surface ravine lies to the south-west, in the tundra.
-Between several of the mountain chains, there is a unique "verdant valley," a thin strip of un-snowed on ground that has some un-snowed on trees in it.
-There are several waterfalls around.
-At X -16, Y 11, Z 9, there is a spider dungeon with 2 treasure chests. It's practically right under you at spawn.
-Plenty of good cave systems, several patches of diamonds that are not hidden in walls, etc.
To those of you looking for pics: