You can install the wallpaper either by uploading it to your pictures folder via iTunes and select it as your wallpaper in the Pictures app or you can put it into your favorite SummerBoard theme folder: /var/root/Library/SummerBoard/Themes/Aqwoah/Wallpaper.png
Now to the Slider turtle. Make a new folder on your PC and call it AqwoahMarine (or anything you want). Copy the turtle image into that folder (name the png turtle.png). Then navigate to
var/root/Library/Customize/MainSliderImages/
and copy the AqwoahMarine folder with the turtle.png into that directory. If you want the slider to also replace the red power slider and the green call slider, then navigate to
var/root/Library/Customize/PowerSliderImages/
var/root/Library/Customize/CallSliderImages/
and copy the AqwoahMarine folder into there as well. That's it. Simply select the turtle image in Customize and you're done.
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