Note: I'm not fully suggesting this be added, as it would indeed take a long time to implement, i just wanted to see the community's views on it.
Basically: What if the inventory tiles were smaller? One tile right now would be split into 2x2 smaller tiles. I mean, seriously, how does four blueberries equal the size of a board, or twice that of a pickaxe?
If it were smaller, sizes could make a little more sense. One blueberry is one tile, a carrot is two, etc. Powders could increase in size by how much is in them. (0.10 is one tile, 0.30 is 2x2 or one current tile, 0.50 or more is 3x3.)
I've always liked this idea, what do you think?