This seed offers everything you need to be able to make colored concrete and concrete powder blocks in Minecraft 1.12. The recipe is simple: you need 4 blocks of sand, 4 blocks of gravel, and 1 dye of any color.
You will spawn in an area that has all these components, and also a source of water, which is necessary to turn concrete powder into smooth concrete blocks.
Additionally, not too far away from the spawn point, you will find two villages at coordinates -280 -488 and -296 -792. Both villages have blacksmiths with some excellent loot: