As you might remember, a lot of wallpapers were removed from the site to save diskspace, which is limited by our hosts. However if you'd like to submit your wallpapers or miscellaneous artwork, I invite you to do it here
Sure Reza, it's possible. But free hosts can change the rules anytime and then you have to move. Moreoever, they usually do not allow you to only store files, there have to be pages too. Last but not least it's more practical to have it all in one place.