Have a look here:

http://topsony.com/forum/showthread.php?t=201

It should be about the same with your phone to customize. Anyway a better tool is phone xs or xs++, but it works the same.
Just check what cid your phone has since customization is only possible up to cid 49.
I'd just recommend to edit your own menu.ml and layout.xml instead of using those from the icon themes you find. Just compare the entries in the original menu.ml from your phone with those in the themes.
It is not very hard.