Noob Question - Folder Background

any1 knows how to make the folders background transparent ?
i tried to delete the background folder but that didn't work

 

i'm srry guys looks like i wasn't clear, i already have a folder icon that gives me the clear looks, which is what ClearFolders does,
what i meant was a way of making the actual folder background clear as in when i open a folder instead of the grey pattern background,
to have transparent 1, i understand i need to use a "FolderSwitcherBG@2x~iphone.png" file 4 it but can't figure how to make it transparent

tnx 4 the speedy replay tho i appreciate it

 

tnx 4 the replay Chambone, i did as u said but something not working
when i check the file in web browser it does has the transparent effect,
but when i check it in different picture viewer software i get a white image
and if i place it in my iPhone it gives me a black background, what am i doing wrong ?

P.S. i attached the file i made and a screen shot of what i get on my phone:
View attachment FolderSwitcherBG@2x~iphone.zip