I recently held a workshop to teach students about e-textiles, and so I was looking for a cheap way to allow learners to make something that’s programmable, and that lights up and plays music. The instructions for the participants had to be easy to follow as well. I eventually came up with the idea of sewing a circuit onto a felt patch using a LilyTwinkle. Based on the ATTiny, the LilyTwinkle is a fraction of a cost of the LilyPad Arduino and can still provide good entertainment. The felt patch can be used as an applique onto any wearable you want. You can sew, hot-glue, or velcro it onto a sweater or pillow.