Just to let you know, these wallpapers are the ones we use on our own computers. We don't remember where we got them. So, if you see your wallpaper here, and you can justify that it belongs to you, we'll give you credit for them.
We also have wallpaper here that we have made ourselves. If you would like to use them for personal use, go ahead ^_^. But if you'd like to post them on your own site, let us know first.