This is important: The tonal manicure is everywhere. Unless your Instagram explore tab is stacked with nail art, you may have missed this fact.

But unlike other nail art trends that require a steady hand (and, realistically, many other skills), the tonal manicure is very easy to do. Pick a few shades in a color family — variants of blue, green or gray, perhaps — and paint.

“Most people have a favorite nail color,” said Amy Lin, the founder of Sundays, a wellness-focused nail studio in New York. “And they own polishes that are many different shades of that color.” In other words, you already have everything you need.

Ms. Lin has noticed that tonal dressing — a knit tank and midi skirt, say — is trending in fashion, too. But she thinks the tonal look appeals to her clients for other reasons. “Choosing shades that work together is an artistic way to engage with color,” she said. “The process sparks their self-expression and creativity.”