Originally Posted by ToxIk
At first they look like scans, but, from the depth of field shown in some pictures, they obviously aren't. The background is probably just green-screened out. Pretty easy to do if you have a uniformly coloured background and know how to use the magic wand tool in photoshop. The magic in the magic wand does a lot of the work for you ;)
FYI, the camera imprinted JPEG EXIF metadata has been retained on these pictures. This will tell you a bunch about what camera settings were used to take the photo, if that's what you're interested in.