Minecraft 1.12 seeds
Checked with Seeder's engine on .
The World of Color update. Concrete and glazed terracotta. The world generates just like on 1.11, but tons of modpacks still play on this version. If your mods don't change world generation, these will be some cool seeds to play around with.

1 Village at spawn: A village 57 blocks east of spawn.
Seed545366294130876
What X, Z Distance Village 64, 0 57 blocks Desert Pyramid 208, 240 306 blocks Stronghold -812, -1180 1.4k blocks Spawn in a savanna at 8, 8.

2 Mushroom island at spawn: A mushroom island about 260 blocks across right at spawn.
Seed-6194647098030230154
What X, Z Distance Mushroom Fields -10, 98 23 blocks VillageZombie village 48, -144 239 blocks Stronghold -1228, -668 1.5k blocks Spawn in a plains at 12, 92.

3 Mansion near spawn: A woodland mansion 59 blocks south-east of spawn.
Seed38338532120855893
What X, Z Distance Mansion 224, 288 59 blocks Village 176, 608 364 blocks Stronghold -60, 1668 1.4k blocks Spawn in a forest at 184, 244.

4 Monument at spawn: An ocean monument 49 blocks east of spawn.
Seed4670705464203460
What X, Z Distance Monument -208, 112 49 blocks Stronghold 1460, 916 1.9k blocks Spawn in a forest at -256, 124.

5 Witch next door: From spawn: a village 36 blocks north-east and a witch hut 32 blocks east.
Seed182264967863721758
What X, Z Distance Village 32, 128 36 blocks Swamp Hut 32, 144 32 blocks Stronghold -892, 1492 1.6k blocks Spawn in a plains at 0, 144.

6 Ice Spikes: An ice spikes field about 300 blocks across right at spawn.
Seed-7909005634116222244
What X, Z Distance Ice Spikes -102, -50 2 blocks IglooWith basement -224, -400 372 blocks Stronghold 724, -1180 1.4k blocks Spawn in a snowy mountains at -103, -48.

7 First End City: An end city 1,024 blocks south of the main island.
Seed7906374076292
What X, Z Distance End CityNo ship 16, 1024 1.0k blocks Overworld spawn at -216, 256.

8 Flower village: From spawn: a village 32 blocks south and a flower forest 65 blocks south-east.
Seed6159843630366268
What X, Z Distance Village 256, 288 32 blocks Flower Forest 302, 302 65 blocks Stronghold 1444, -508 1.4k blocks Spawn in a wooded hills at 256, 256.