v1.5.2 The "folder-icon" should be displayed in the context menu for the "Create new folder"-entry. This already is the case for "Create folder" in the context menu on the desktop.
there is no icon for this
Created attachment 4751 folder-icon on desktop
Created attachment 4752 no folder-icon in thunar
On the desktop there is. Take a look at the screenshots I attached.
There is no new-folder icon in the spec, the regular folder icon is not suitable for this, i can't help it it's been used in xfdesktop.