"Blackbird" is a mix of coppery browns, steely blues and greens, and warm black, with occasional pops of bright color. It's made by glazing, one of my favorite techniques, where overdyeing bright colors with black yields gorgeous muted, warm, tones. This color is pooling, meaning that the colors repeat somewhat regularly.
This yarn base, Home, is soft-but-sturdy worsted weight yarn. I'd use it for sweaters, hats, scarves, blankets—it's versatile, but still great for next-to-skin wear. It's 100% fine organic merino in a 4-ply; 219 yds, 100g. Hand wash, dry flat.