Just ran out of your eyebrow pencil? Use a dark brown or brown-black eyeshadow shade to fill in your eyebrows instead. This not only helps you to maximise your eyeshadow usage, but also gives you a softer look when applied with an angled tip eyebrow brush. Stay away from shimmery or metallic shades and stick to the matte ones.
Alternatively, you can also use eyebrow shadow palettes as eyeshadow palettes. Browns and dark brown-blacks will be great for a day-to-day neutral look.