These media panel icons were inspired by Nielssonnich's '5 menu-icons' themes. They look best using his white orb icons for the gnome main menu available here:
For Arch Linux:
The icons are available with both white and black play, next, and previous images in the archive.
Installation is fairly straight forward. Just use them as icons for launchers added to the panel and point the launchers to the play/pause, next, and previous commands of your favorite media player.
As can be seen from the screenshots, they can be put together in different combinations to achieve a desired effect.