In my opinion, leadership, creativity and flexibility are not best conveyed by the backdrop color of a headshot.
Note that I said headshot, as that is what I would typically recommend for any resume/CV image.
Instead I think that it is important to consider your audience. Are you(or the user of the image) applying for a position as a manager in a corporate environment? Then use a soft background with pleasing soft shadows that don't take away from the subject. What color the background is less important then capturing a technically high quality image. Make sure the subject is wearing colors that compliment the background. If you are applying for a creative position you might want to skip the headshot all together as well as any rules and try for unique.