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Tumblr Default Header Images: 
You just customized your header image for blog appearance. Wait, no — that didn’t work, you say. Now you want the default pattern back. But Tumblr does not offer an option to revert your header image.

To bring back the pattern, use these download links to the 14 default header images. Then edit your blog appearance to upload the pattern.

Update for kevinthebigapple:
Elusive pineapples header image (edited to 3000x1055 pixels)