According with colour trends for 2021, a 2020 best-seller design with those  2 colours:

PANTONE 17-5104 Ultimate Gray + PANTONE 13-0647

” … two independent colors that highlight how different elements come together to support one another… a message of happiness supported by fortitude, the combination of PANTONE 17-5104 Ultimate Gray + PANTONE 13-0647 Illuminating is aspirational and gives us hope. We need to feel that everything is going to get brighter – this is essential to the human spirit…”