Seeds/Potions/tipped darts only differing by color is intended unfortunately. There's a duality to the consumables where potions/seeds differ by color and scrolls/stones differ by symbol. The darts are going to differ in shape between tipped and untipped, but otherwise will be the same. Probably if I were to ever improve the differences here it would be by adding icons to seeds/stones/tipped darts like potions and scrolls already have.
You're the first person who've said they prefer the wavier scrolls actually. The common argument seems to be that the curvier symbols are just too hard to distinguish versus the simpler flat ones.
Those hero sprites are fairly outdated at this point, they will likely be changed a fair bit before being re-shown.