Amps, iPod chargers and mice made of Altoid tins, Atari 2600 cartridge getting a new life as flash drives- just about anything can be used a great project case. Even an empty pack of cigarettes. Here’s a neat example of an under $30 DIY pocket amp on an Archos 20 Gb mp3 player with open sourced Roxbox firmware, and Etymotic ER-6 headphones. The surgeon general has determined that this project is smokin’.
DIY Marlboro Amp