About paintings on the internet for downloading and printing ..?

Hi guys .. I am searching for a good painting over the internet which is available for downloading in the same size that is it about to a portrait for my newly built house .. but i can't get any websites there can any one inform me about such a websites or can any one give me a option of how to do a portrait just by downloading pictures over the net .. all the answers are invited .. Thanking you in anticipation..