myhdwallpaper wasn't that hard either:
Choose your category e.g:
http://myhdwallpaper.com/v/Celebrityand ... allpapers/
Settings: All Pictures, All levels, mark Page location as: Within current directory and deeper
Picture location: Anywhere
Resolution: if you want 1024x764 u write -1 in Picture url include Filters box (seems to be most pictures at this resolution)
If you want resolution the highest resolution ( above 1024x764 but not possible to define otherwise) you put : -3 in that box.
If you use : -2, then it seems to be only thumbnails you get.
Voila
