Welcome to the ModularItemFrame!
Modular Item Frame adds just one block: Modular Frame.
Placing it will create an empty frame.
Placed Frames can be fed with different modules.
Modules can be further enhanced by frame upgrades.
Current modules and their features are listed in the wiki.
Example the most basic "item module"
(Sadly my Imgur didn't work after this gif. I will upload more once I had the time finding the issue.)
Special thanks to Siphalor for the awesome textures!
I have currently no plans backporting it to forge.