Complex icon (front-end challenge!)

Time for a little round of How would YOU code it?, our favorite game of deciding the best way to mark shit up.

See those little status icons? The bars next to the coverage level? How would you code it? I've got half a dozen options in my head, and don't know what would be best.

Images? @2x? Sprites? A font? SVG? Straight code (tiny divs!?)?

keyboard shortcuts: L or F like Z toggle zoom post comment