1. Boards

2. Pumpkins

3. Straw

It just makes my OCD flair up that they can't be stacked neatly and easily.
Many different types of stockpiles have overlapping models like carrots:

Visually I wouldn't mind if they were squashed together. If that's a problem, just shrink the models by 33% so they only occupy one tile.
Small quality of life change. Otherwise, thumbs up on stockpiles.