Danbooru-based image board with a specialization in high-quality images.
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Non-porori (but with loads of "mists") version (as background of age confirmation page): http://www.moresoft-info.jp/monako/goshumei/wp-content/themes/goshumei/images/front-bg.png
Removed the transparency (too small for Yande.re after cropping out the blank): http://img7.pixhost.org/images/568/32877615_front-bg.png
Basically just remove (not equal to "apply" them to a white background) the alpha channel.

Since Photoshop somehow doesn't show alpha channel explicitly, you need:

1 Go Layer->Layer Mask->From Transparency. This will "transfer" the transparency to a separate mask
2 Delete the mask
3 Profit! (Better flatten the image as well to reduce the size a little bit)

You definitely should be able to do this with other software too but you need to figure it out by yourself.