Based on the Classic themes, although they are based on the modern Murrine engine they look nothing like old systems. I loved the Classic Aqua theme (worth checking out) but felt an aqua theme needed more roundness, so I rounded it, the bright colours hurt my eyes to look at for prolonged periods of time, so I toned down the colour. Finally I decided it needed some animation so I believe I animated the progress bars. I then decided to release it.
Its colour theme able so please do feel free to change it to what ever vibrant or dull colour you want, I wont judge ;)
I suggest the bamboo zen metacity theme and have bundled it for the convenience of users.
I will note however the licence for that can be found here: http://creativecommons.org/licenses/GPL/2.0/