When a folder contains one or several images, their thumbnails are displayed on the folder icon at… let’s say playful, angles. (See attached snapshot)
This look is fine, but I’m a bit bored and I feel like changing it.
Is it possible, through theming or any method, to modify those angles and straighten the thumbnails? l mean, having their bottom lines horizontal, not diagonal. The angles must be declared and editable somewhere, aren’t they? 
I couldn’t find any info on this.
And what about modifying the spacing / size to avoid or increase overlap?
Even if it’s not possible, thank you to everyone working on anything KDE 