There's really not much more to say on this post then simply, "dyeable pouches," as its a pretty straighforward suggestion.
Pouches should be dyeable different colors with. I for one can't stand having 8 different pouches in my inventory and not knowing which one contains my money and which one contains my building bricks or whether I accidentaly left a important pouch at my base. I know that they can be named, but its still annoying to have to role over them all to find the right one, and it can be confusing. This feature would allow you to color-code you pouches (e.g, you could put the lave in an orange pouch and the money in a white pouch and the stone in a grey pouch) and genearally make orgainization easier, while at the same time, adding that little spark of color you need to spice up your inventory.
Whether or not NPC's would dropped dyed pouches is not my call but I'd would imagene they wouldn't.
Also, in case its not obvious, you would dye pouches by putting the pouch with the chosen dye in a crafting grid.