Hello guys, I've been tunning this old system changing icons, visual style, etc.

I managed to change a lot of icons such as folders, but there's one view I don't know how to change



I want to change the icons in the tool bar and like to add a visual style for the left pane, but I don't know how to

And the view I was talking about before is this one, my folders and desktop icons are default:



I would like to change those too because it's not fair

Salutes