Anyone know where I can find a font or graphic of upper case letters similar to the attached picture with the embellishments
In the printing and typesetting trade these are generally referred to as 'Dutch Initials' regardless of the actual face used for the letter. Regardless of what they're called, you should only ever use one, as in one, as a drop in paragraph starter for the first paragraph of a chapter or to lead off a line of copy set in a specimen face. There are literally thousands of them available in every style known to man. Unless you're setting a book all you need and should ever use is one for any project.