Today, i present you 10 of the best seeds dedicated to mushroom islands. This is the result of my search of 300.000 maps. 5 seeds will be for 5K map, going from -5000 -5000 to +5000 +5000, and 5 seeds will be for 2K map, going from -2000 -2000 to +2000 +2000. The 5K maps are great for small survival servers or big solo maps, while the 2K maps are perfect for solo players. Those seeds have been found for the 1.15.2 java version.
5 mushroom islands seeds for 5K map
Seed : -6285298726645371246
Description : A great 61 biomes map with 9 mushroom islands. A nice one is located around -1200 -700. A very good seed to play with a lot of oceans and islands too.
Seed : -5970115169233576017
Description : A 56 biomes map with 9 mushroom islands. A very big one is located around -700 -3300. The spawn has a nice location with quite a lot of biomes.
Seed : -4031307030602620469
Description : A 58 biomes map with 7 mushroom islands. A very nice one is located at -3800 -1800 with a frozen ocean all around it.
Seed : -3561248009902031536
Description : A 60 biomes map with 6 mushroom islands. The closest is around +1000 -1000. All majors biomes are here to give a great experience.
Seed : 6510551766184858481
Description : A 56 biomes map with 6 mushroom islands. One is located almost at spawn and another one is quite big around +2400 -2800.
5 mushroom islands seeds for 2K map
Seed : 5850762947653575868
Description : A 48 biomes map with 3 mushroom islands. One of them is really nice and very long at -1100 +800.
Seed : -5911332063083079129
Description : A 44 biomes map with 5 mushrooms islands. This is a nice seed for those who want to build multiple projects on mushroom islands.
Seed : 2482702903827607482
Description : A 39 biomes map with 2 mushroom islands. One is quite big for a large build and well placed . A smaller one is surrounded by a forest and a plain.
Seed : 3837472517785237858
Description : A 38 biomes map with 2 mushroom islands. They are located next to each other. A nice project can be done here.
Seed : -4164804374273537607
Description : A 39 biomes map with 2 mushroom islands. One is right at the center of the map, near the spawn. An easy access for a nice place.
I hope you enjoyed this selection. I will keep posting those kinds of list, do not hesitate to ask me what you are looking for !
(This screenshot is from the seed : 5850762947653575868)