Well, I'm getting better finally!
The image used is "audio+visual" and *MouseMaster1989 is the author. It can be found here: http://www.deviantart.com/deviation/54271392/?qo=881&q=headphones&qh=boost%3Apopular+age_sigma%3A24h+age_scale%3A5 I hope you like what I've done with it!
To install this splash screen, first make sure amarok is closed. Then, click the "download" link, download the .tar file and extract it somewhere. Then, copy the splash_screen.jpg file to ~/.kde/share/apps/amarok/images (if the "images" directory doesn't exist inside the amarok folder, just create it!). Should work! If you have amarok open and you replace the file, you'll have to restart it once or twice to get it to work.
PLEASE! Leave some feedback for me if you can!