So this combination was a bit unintentional to start with. I bought Loreal Feria's "Bright Black #21" Thinking I'd get a shiny, solid black color to contrast my green hair. The picture on the box shows a woman with BLACK hair. The color swatch shows BLACK hair. Slapped on the dye and realized, OH F*CK! It's navy-freakin'-BLUE! As you can imagine, I was MAD.
Well, I still had some faded green bits left over from my previous dye job. I felt like a true green wouldn't look good with such a dark color of blue, so I reluctantly decided to say good-bye to super-green hair(for now at least

) for a while. I was going between a light blue or a teal color to put on the remaining bits, and I think you can see which one I ended up choosing. The teal is a mix between Special effects Blue Velvet and Limelight. I'm content at the moment, but as soon as this blue mess fades, it's back to a REAL black for me!