I have to wonder why people ask for wallpapers when some of us include links to wallpapers and/or information about screenshots through a link in the post or through our signatures. We do that to minimize follow up questions that you can easily answer yourself.
If we don't provide the information or links, then fine ask away. But I have had people ask for wallpapers before...they're always linked in my signature. Is it invisible to some? Of course, from time to time I forget to put a wallpaper in my dropbox...feel free to remind when I do that.
I do love all the work everyone shares though...continues to inspire to change it up and try new things!