Leaves carried

 leaves_carried  was a block which was used for storing the item model for leaves.

Obtaining
leaves_carried is only known to be obtainable through the use of inventory editors and other external tools.

Breaking
The speed at which leaves_carried breaks is not currently known. They drop themselves when broken with Shears.

Appearance
In its base state, leaves_carried highly resembles actual leaves. There are, however, differences: the main difference is that it appears darker than normal leaves, which is due to them using a tint, despite the texture they use already being colored, rather than the grayscale which tinted blocks usually use. Specifically, this tint is the color.

However, higher metadata versions of leaves_carried behave unexpectedly. Perhaps most interesting is metadata 1, which corresponds to spruce leaves, which uses a crafting table's side textures rather than anything relevant to leaves. This could be explainable through examination of terrain.png, however, this is yet to be done.

Metadata 1 (corresponding to spruce leaves) is tinted with, and metadata 2 (corresponding to birch leaves) is tinted with. The behaviour of metadata 3, which corresponds to what would eventually become jungle leaves in the same version that removes leaves_carried, is currently unknown.

Functional differences from leaves
Despite very closely resembling leaves visually, leaves_carried do not decay.

Other differences, such as whether they drop saplings when broken without shears, or indeed drop anything at all, are unknown.