LOL I originally had my scrapbook pages as my wallpaper but then decided to try doing it to the screen size. Not sure why these are showing up about 10x bigger than they are though LOL
If you want to make your own scaled to the phone they are super fast and easy too. Just google the dimensions you need for your particular screen, set the background layer to those dimensions and scrap as usual. Leave room for your icons too. I ended up moving the front page of my icons back one page and only leaving the top row of icons so I could see most of the image on the first icon page.
I have an iPhone 4S (iPhone 4 wallpaper should be 960 × 640 pixels and 326 DPI as per the internet).