default icon folders at home karmic koala

[iruel]

my default folder are
-Home
-Documents
-Picture
-Videos
-Downloads
-Music

but i need created one more directory it's like
-Home
-Documents
-Picture
-Videos
-Downloads
-Music
-Master << new folder
how to set default icon folders at home??i was trying set in "./config/user-dir.dir" with add this line
XDG_MASTER_DIR="$HOME/Master" or XDG_MASTER_DIR="/home/myhome/Master"
and i was create one new icon at /usr/share/icons/Humanity/scalable for all size with name folder_master.svg and folder-master.svg
but that is still useless,can anybody help me solved this???please:(