A simple Resource Pack that makes Item Frames invisible.
Has been tested to work on versions ranging from 1.4-1.21.8+, but will most likely work on many newer versions after these.
If you're having a hard time destroying the frames you can press F3 + b or Fn + F3 + b to toggle their hitboxes.
And here to download the map item frame version.
Versions below 1.8 will still have the birch frame visible, but the background will be transparent like this:

Details
Licensed MIT
Created 3 years ago
Updated 6 months ago