To anyone having trouble with the previous sizing, resolution, "making the green box bigger", etc etc etc....try this; it may work, it worked for my EVO...

It might sound odd to make the file size bigger, but like I said it worked for me. Transfer the pic you want to set as your EVO wallpaper to your PC and open it in any image editor (ie: photoshop) and resize it to:

1952 x 3264

Save it, put it back on your phone: dcim > 100media. After you have re-mounted your sd card open your gallery > all photos > select the pic > menu > set as...and magically the "green box" (which everyone stresses will expand) should expand over the whole image without losing anything.

Try it....???