I found this MP3 Player concept that I really like. Author is Heeyong Shin.

The idea of ¡°Cube¡± is from Rubik’s cube puzzle. The way to play music is similar to playing with the Rubik’s cube puzzle. Users can listen to the music while having fun.

I think that the idea is quite good, and if produced well it could be a hit. For few more pictures go here.

via gadgettastic