Minecraft-seeds.net offers many great seeds for Minecraft 1.8.7 and lower, as of July 2015. One particularly interesting seed available on this website includes a flat spawn point in the midst of a magic forest biome and 12 dungeons. The seed number for this map is 4815162342.
Epic Minecraft Seeds also offers interesting seeds, including one that features a Savannah Mountain region extending above the cloud line. This seed can be found using 5574457897082764526.
Another cool seed is 53526209, in which Minecraft generates a map that includes a desert temple and a village near the spawn point. This seed also has a wide array of biomes in the immediate area.