If you are on an iPhone 4/4s, I just helped someone in the iOS Boss thread on modmyi on this same issue recently, and he was able fix it with the info I posted... you can use the 3 row iconoclasm plists I used to use on my iPhone 4 as a starting point (below).
The Columns should be set, so you don't have to mess with the "Cols" values. All you have to adjust is the "Rows" values to move them on the shelves of your wallpaper. Lowering the value will raise the Row up... and raising the value will move the Row down.
Just create a layoutname.plist file (example given below) and shsh the files into /Library/Iconoclasm/Layouts. You will have to respring to see changes from changing values.