I'd love to see some variations on the microphone concept:
* different grille patterns (eg square grid instead of staggered circles)
* colors (perhaps three colors instead of just two)
* different typefaces (clearly my spec has been proven wrong by you; I'm not as close-minded to the use of serif fonts as I thought)
I've ranked
#4 highly because it's novel and I've looked over your previous work (going so far as visiting your website and perusing your portfolio) and think you have a good eye. I'd like to see designers play with this and surprise me. It may come to naught, but as I said, you've proven to me that my preferences are not set in concrete.
Thanks for posting!