This may be treason, but I've had success using wallpapers formatted for the iPhone 4 screen and cropping a small portion out.
For those unaware these are the resolutions
IPhone 4 960x640
EVO 3D 960x560
Basically you lose 80 pixels in width, and its very easy to find iPhone wallpapers.
Evo 3D, and qHD resolution is 960x540, not 960x560.