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!

This mod also requires two additional APIs found here and here.