Today when I was on minecraft I made a new world with a random seed that I just thought of, it was 'THE HOLE' and it spawns you in a plains area on a small hangover near some pumpkins and behind and to the right of the spawn is a regular forest and if you go slightly to the left and forward you find a desert with a jungle to around it. Back at the spawn if you go to the left you'll find a mountain biome with many arches, hangovers, and waterfalls. I think this seed is really good for a survival world, so try it out!