Plugin for generating the entire audio waveform seekbar?
I think if I was going to do this quickly as a one-off, I'd cheat.  I'd open the audio file in an audio editor, like Audition or Audacity, grab a screenshot, then modify that screenshot in Photoshop &amp; AE until I got the look I wanted in After Effects.  If you need a scrolling line through it as it plays, just position a line at the beginning of the waveform, then add some linear position keyframes to move it through the waveform at the right rate. 
It's an ugly hack but for a one-off, it's probably the quickest solution.