Modular Item Frames increase the usability of frames to give you tools that also take up a minimal amount of space. You set modules into item frames to perform different tasks. The tank module gives a small amount of liquid storage you can see right on the frame.
The crafting module puts a crafting table on any wall.
The teleport module provides a link between frames. You can set a location using the screwdriver.
And the nullify module acts as an item deletion tool!