TL;DR
Items that have variated icons should use these variations in inventories as well.What ?
When iron ore, copper ore, coal and stone items are placed on a belt they randomly use four different sprites to give them a more "raw" and interesting look. I suggest that these variants are also used when items are in inventories such as chests, wagons, ̶m̶a̶c̶h̶i̶n̶e̶s̶ * and the player inventory.Why ?
To begin with this would look pretty nice (in my opinion). Secondly this would make the game more consistent as the way the raw materials are displayed in inventories would be equivalent to the way they you can see them on belts. Finally these items would look even more "raw", a good indication, that you have to process them further.Extra
Make icon variants for sulfur, wood, fish, solid fuel*, uranium-235 and uranium-238 as well. viewtopic.php?f=6&t=77018* Edit as a result of the discussion below