Oh my, these free downloadable images of the letter O would make a fine addition to arts and crafts projects and webpages where a drop cap O is needed.
All of these pictures of the letter O are copyright free in the United States. This image was used by the author Henry R. Plomer in his 1900 tome A Short History of English Printing.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.