Please can someone explain to a bear of very little brain how to actually get some of these onto the device. Do I need to download (and install?) prismic first? Do I d/l them to the pc and transfer? (If so which folder?) Do I just d/l direct and they'll have whatever is needed to make them install? I'm not overly impressed with the wallpapers that n900 came with and some of these are amazing. Pretty please?