This downloadable, public domain fancy letter O has a delicate look with flowers and ivy leaves draped over the letter. Leave it in its slightly grungy look or with a little editing change the background to a solid color.
This vintage drop cap image dates back to at least the year 1868. I found it in The Myrtle Branch but it was probably used in a number of publication from that time.
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.