The Colorsonic MP3 player concept displays colors around its ring-shaped body, which can be matched up with a certain mood of music, like an old-school mood ring.

This MP3 player is designed to match user-created playlists with mood-appropriate colors. Users would then choose music by selecting the color closest to their mood at the time, rather than by so-called "normal" and "intuitive" methods like Artist or Album. Exactly how this works, I don't know; but according to Yanko, "it’s got special software." Hmm, ok. [Yanko via Wired]