A list of 10 sites which all have high resolution photos (2000-3000 pix)
for free download.

www.morguefile.com
www.everystockphoto.com
www.imageafter.com
www.nationsillustrated.com
www.openphoto.net
www.pixelio.de
www.stockvault.net
www.unprofound.com
www.photogen.com
www.sxc.hu

There are literaly millions of photographs, there is even a site that finds the
right image for you, photorogue.com. There is no need to ever buy a photograph.

Notice that you will not find any site on internet where
you can download art for free.