Floating Islands (Void Dimension)

The Triplet Islands have 3 parts. Surface level, second level (Reachable by rope) and the top level (Also reachable by rope) which has a large hole in the middle and 3 waterfalls coming down.
 * -| Triplet Islands =

This area tends to spawn a Strange Fruit cluster, and it has trees with jelly on them.

Sorry for low resolution image.

The Inverted Island is a floating island in the Void Dimension. It appears to be upside down but has a regular island at the top of it. The way to get here is currently unknown. However there have been sightings of players hacking or glitching onto this island and farming bloodfruit and jelly. So far, the only way to get here is by leaf jumping.
 * -| Inverted Island =
 * The upside down trees and bushes are actully breakable with ranged weapons.

Trivia

 * There are the small floating islands that players spawn on in the Void Dimension, and some of them have Mercy Trees.