1.
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Open a random PowerPoint document.
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2.
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Click with your right mouse button on document and select Format Background...
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3.
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New window will appear, where you select Fill on the left side and after that Picture or texture fill.
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5.
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Within Explorer select a random picture and click Insert.
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6.
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Picture will be set up for current slide.
Click Apply to All to set it for all other slides too.
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