I gathered a bunch on high resolution personal photos (family, pets, vacations), opened them in gimp, cropped them so that they were the correct ratio than scaled them down to 800x600. Lastly i converted them to grayscale. Some were landscape, some were portrait. If they were landscape i had to rotate them clockwise. The hardest part was trying to get the right ratio without cutting too much out.
They fill the whole screen and look great!
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