Widok miesiąca and other 86,700 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This is a series of rectangles in which you can draw in whatever you want into the days. It's a bunch of lines going criss-cross, as in one goes perpendicular and the other vertical. They do this until they make a pattern in which can be written in between.