Design
From LXDE.org
Contents
Logos
Templates
Posters
Wallpapers
Config for wallpaper in directory /home/you_user/.config/pcmanfm/main.lxde
[Desktop] show_wallpaper=1 #0(disable black desktop) or 1(enable wallpaper) wallpaper=/usr/share/lxde/wallpapers/lxde_blue.jpg #picture to wallpaper