Back when I taught high school art, I did a pixelated self-portrait project with my students where they had to mix their own varying shades of grey & paint it in much the same way as Honest Abe was painted. It's a great school project for learning about value, but not something I'd really want to do to decorate my home. Nite has the right idea though! Using paint chips to create a large-scale portrait on a wall is a stroke of genius! So stunning, yet so easy.