https://xubuntu.wordpress.com/2007/08/27/howto-remove-the-borders-of-your-desktop-icon-text/
1) Open up a terminal, and create and edit a GTK configuration file:
touch ~/.gtkrc-2.0
nano ~/.gtkrc-2.0
2) Copy and paste in it the following:
style "xfdesktop-icon-view" {
XfdesktopIconView::label-alpha = 0
}
widget_class "*XfdesktopIconView*" style "xfdesktop-icon-view"
You can also change the font colors.
style "xfdesktop-icon-view" {
XfdesktopIconView::label-alpha = 0
base[NORMAL] = "#3F6BA4"
base[SELECTED] = "#3F6BA4"
base[ACTIVE] = "#3F6BA4"
fg[NORMAL] = "#ffffff"
fg[SELECTED] = "#ffffff"
fg[ACTIVE] = "#ffffff"
}
widget_class "*XfdesktopIconView*" style "xfdesktop-icon-view"
3) Save, quit and log out
Ctrl o
Ctrl x