i used to draw shapes like this on textbooks or test papers with marker pens.

keys:

• space: play / pause
• S: save as png
• E: save as png with a transparent background
• D: duplicate pixels to make it deeper

features: color palette: black (5%) / white (5%) / monotone (18%) / duotone gradient (72%) paper: Regular / Smooth (10%) wet: false / true (40%)

caution: the result depends on window size.

made with p5js