If you have email on your phone, email them to your self and then to your new phone. If not, if you can, transfer them via a cable to your PC and then to your new device.
OK, sending 500 pictures via E-mail on the phone will take too long, connecting USB cable to PC will work, but you need to know which software to use, Doc! DO NOT bother installing "Motorola Phone Tools", it doesn't work with V325, no matter which version you try... The software to use is called "Bitpim", works like a charm: http://www.bitpim.org After you install the software, connect your device, click on the "Get Phone Data" icon, then check "Wallpaper" box, click OK, voilà!