Stippling - Stippling is the art or process of drawing, painting, or engraving using numerous small dots or specks. The areas of light and shadow are created using nothing but dots. It has a gently calming effect on me and with some peaceful music I give in to the process and forget troubling things for a bit. Maybe something like this but very low - https://www.youtube.com/watch?v=Ilx_Fi5qD0k