A company in Korea called Axxen has created the PLEIO, a thick MP3 player that displays album art in a circle on the front of the player. In the center are the controls for the MP3 player. Such a device like this is a novelty at best.
The player comes with 128MB of storage, and with the added album art, you can play less songs than a traditional 128MB MP3 player. That might be enough for two albums at most, and with the cost of using a photo display, this MP3 player would cost way more than in the nromal price range.
There is some discussion on this product over at PDA Live.com, and product information can be found on Axxen's website, which is provided below.
PLEIO Prodcuts at Axxen [Via: Axxen]