Here is a way how to install iPhone themes....
1) u need to download DiskAid from http://diskaid.en.softonic.com/
2) connect your iphone to your pc via data cable
3) open DiskAid
u will get a page like this
than u need to go to the Root Folder instead of the media folder like this
once done,in root folder there is a folder Library/themes
the zip files u download from m9 gallery has to be unziped, n u need to paste the folder in library/themes.