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In-game Resource Pack Editor
I'll start off by saying I have no idea if this is even possible in coding terms but sound simple in my head.

In-game pack editor

Click on a resource pack you want to edit, it opens another window with all the png files in the pack.
You could then click on the diamond sword for example and that would open it into a built-in paint window for you to edit/save.
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good idea
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Sounds like a hell of a lot of work. Not saying it can't happen, but that would 100% be something in 3.0 if it happens.
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