Grass

Grass was added in tu1 cu1 patch 1 update 1.0 Grass It used mainly for farms animals sheep it is the first layer in Minecraft 2nd layer being dirt. Here's a picture of grass Here's a another picture of grass on snow.

Grass blocks can spawn sheep, pigs, cows, chickens When a player right clicks a grass block with bonemeal it can grow dandelions poppies Tall Grass may grow. Grass will take some time to cover dirt blocks. Biomes change the color of grass.

How to obtain
Mine with a silk touch-enchanted anything.

Or kill an enderman with a grass block in its hand.

Trivia
Anything enchanted with silk touch will mine a Grass block with the grass on it not just a shovel.

Grass blocks used to have the grass textpure on all six sides.

Snow does not inhibit the spread of grass.

Grass takes a fraction of a second longer to mine than dirt.