Imagine if they added drafting paper, same recipe as item frame with paper instead, and this can be used to draw on them put into an item frame instead of making map drawlings. You would need a way to draw so why not dye mixed with ink sacks into a bottle which turns it into bottled ink of that color. This plus a feather could give you a way to draw and a paper canvas. Very vanilla-friendly. If getting more mod heavy the bottled ink could be used to color spectral arrow glow, brew a potion that tints the player's skin for the duration(fading underwater). Sounds like a community-friendly and vanilla idea so I thought I would put it out there.