Silky sleeping masks (eye masks), that are available in a variety of colours, and which can be printed with anything you'd like. Check out the second photo for available colours, and for ideas of what you can print. A printed sleeping mask costs €6.
If you'd like to turn this into a larger gift, they can combine the mask with a silky night dress and scented candle; all packed in a customised gift box. The set costs €20.