It’s green and somewhat simple but this leafy border or vignette might be just what you need to amp up the interest in your project. It is from an 1892 children’s book that contained a number of other illustrations by Ida Waugh (1846-1919). It was originally used on the bottom of a book page where a larger illustration by Waugh appeared at the top of the page and text appeared in between the two drawings. It was a nice look. Perhaps you could check out the other illustrations by Waugh here on Reusable Art and find one that would work well with this leafy border and the overall theme of your project.
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.