you cant mod your player as your firmware is above v9.0.43
but as far as external looks are concerned, you can try searching on ebay for silicon cases for ipod nano which after a little modification can fit in a nano clone as well.
there was a member on this forum perhaps michiganfrog who used to talk about a small chip like thing which when placed anywhere on the player, would enchance the audio and video quality substantially. try searching for that too
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