My three ideas are a mask with red tcross light in the middle, a mask with voice sensor getting brighter when you speak louder, and a bow hair tie with sensor that light up when shake it.
I want to make a bow hair tie that will shine when you look back or shake it. The material is a translucent fabric with ruffled folds, which is glossy. Can insert a light strip in the middle. But it is not sure what sensor to use to achieve this effect.