Stock Images

•   Google image search ‘ extra large images’    e.g. Search for landscapes, extra large images
  

http://images.google.com.au/images?q=landscapes&gbv=2&hl=en&imgsz=huge

• Deviant Art            http://browse.deviantart.com/resources/

e.g Landcapes

 http://browse.deviantart.com/digitalart/drawings/landscapes/#catpath=resources/stockart/places&order=9

• Animals

http://www.hqanimalwallpapers.com/category/Giraffes/

• Shutterstock - very high quality images used by designers - not free - you need to subscribe to this one

http://www.shutterstock.com