Throughout your travels you will find groundcover strewn across the land to give it a renewed look. Most groundcover have 5 randomly selected models. With the exception of fallen leaves, groundcover can be picked up by right click.
Fallen leaves are scattered around the landscape where trees are found. They can be picked up with shears.
Twigs follow the same generation pattern as fallen leaves. Twigs drop sticks when broken, or alternatively can be crafted into sticks.
Rocks are found in almost every biome. They also have sandstone, icy, and mossy variants.
Bones are found in almost every biome. Charred bones can also be found in the Nether.
Pinecones are found wherever coniferous trees are found.
Seashells are found on beaches or on the ocean floor and can be crafted into prismarine shards.