Not many girls paint their leotards, but this video shows someone who did. I must say, she certainly ended up with a uniquely designed leotard! If lots of girls painted their own leotards according to their own tastes, they could have an art fashion show. Maybe the judges could add a new event for rating creatively designed self painted leotards!
If you’d rather apply an applique to your leotard instead of painting it, this video could help.
You could use fabric paints to make an applique to sew onto your plain leotard as well.