Aside from your picture, you can optionally change the background to your profile. Just click Change Cover image, add a picture and hey presto instant background. Use one of your fractals would be the best bet.
Hi Joy, if you click the top right where it says “Howdy Joy”, then a menu will appear, if you move over that with your mouse pointer, then move it over profile, some options appear. Change cover image should be one of those. Let me know how you get on. 🙂