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Swish-2kb
Here's a page of black and white Backgrounds I found interesting
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Metal-4kb
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Dots-1kb
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Chiffon-8kb
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Leaves-8kb
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Microbes-5kb
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Onyx-5kb
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Sand-8kb
This is what I used for my COOL/SICK section.
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Wood2-5kb
Many more black and white ones to come.