My friends and I were planning on starting a survival server for ourselves once 1.8 is officially released, and the possibility of having the nearest ice-based or mesa biome being 20 km away from 0,0 has become a bit of a concern. I understand that things like AMIDST and seed lists exist, but I'm looking for the actual algorithm that Minecraft uses so that I would be able to write a program which would, in some sense, automate seed-searching for particular patterns or features by generating just the biomes from random seeds.
As far as I understand, the biome patterns are entirely deterministic from the seed and are generated via some Perlin noise-based algorithm, but I can't seem to find any specific information anywhere on how the algorithm specifically works besides very high-level descriptions or explanations for outdated versions. However, I know something like this has already been done at least once since the Mindcrack server had its survival server reset semi-recently and specifically picked a seed with extremely varied biomes within a few kilometers of 0,0 due to distance limitations imposed by a worldborder.
In short, what are all the nitty-gritty details behind the algorithm which determines Minecraft's biomes, and how would I go about generating just the biomes from a seed if I intended to?