A perfect village

You spawn on a swamp biome next to a desert with sand (of course), a village, cacti, water, sugar canes, a cave, and oh my, a house with a dungeon inside it!

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Intersection of 3 biomes

Now, this is a truly badass seed! You'll spawn right at an intersection of three different biomes: snow, desert, and grass (default) biome with a river running through them. Requires Minecraft 1.9 (pre-release). The seed is this:

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Massive snow world

Finally snow! This seed generates a massive snow world with snow, snow, and snow, and requires Minecraft 1.9 (pre-release) which you can find and download at Minecraft Forum. The seed is this:

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