Use MobiMB from
http://www.logomanager.co.uk/php/products.php?id=51
You can connect by any method you want (DKU5 cable, third party DKU5
cable, infrared, FBus cable etc)- if you do not have a connection
method already, then I recommend infrared as it is more versatile and
reliable. Check if your PC or laptop has infrared built in. If not,
grab an Actisys infrared port- they sell them on the same site as the
software. If you already have a cable, then you can use that.
In MobiMB, in the help file there is a samples link which includes a
blank logo. Just right click that and 'set as operator' logo, and you
are done.
You can then use any image as your wallpaper from MobiMB (including
photos) as well as transfer games, ringtones etc.