This page has interesting world seeds for players looking for specific biomes near spawn.
3971121552768171949 : Mountain range to the west with Canyons to the east and Bamboo Forest north and further east.
321 : Chaparral in a valley with bamboo and river to the west, and desert/hot desert to the east. Nearby village. Has nice visible ores on the mountains.
20 : Desert/Mountain, with a giant canyon biome split by a Hot River biome to the east with a large lava meteor
-1 : Cherry blossom forest with silverwoods, slime islands
-20 : Has canyon biome near spawn, with mountains and garden
-50 : Pretty mystic grove
-60 : Planet Hoth. A frozen hellhole.
-80 : Nice castle village nearby
-90 : Grove
-100 : Tundra
-110 : Jade cliffs, maple forest, gigantic mountains 700m SE
-120 : Gigantic mountains, Spine of the World. Amazing pair of double redwoods at -50, 750
-130 : Magical forest, mystic grove, bamboo forest
-140 : Hot Desert, more mesa and buttes than Canyon biome
-150 : Canyon biome about 500 blocks SE of spawn, pretty large, has bamboo forest on one side