changing folder bg and multitask bar bg

Installed winterboard and i've set up my ip4 to the way i like, ssh in and replace all the non retina icons.

Whats leave is the folder bg... how change it?

did some research and i'm suppose to put it here
//theme/Folders/SpringBoard.app/FolderIconBG.png

i did and its not working =\ i'm sure it not the png causing the problem

 

thanks that worked