SparkFun LilyTiny is designed to add flashy functionality to a project without taking up a lot of room. This SparkFun board has an ATtiny microcontroller and is as small as some of the LilyPad sensors.
LilyPad
SparkFun LilyPad is a wearable e-textile technology that has been creatively designed and can be sewn into fabric. Various input, output, power, and sensor boards are available. LilyPad is also washable with special care.