Color picking is nice, but it would be amazing if you could select two colors, and it selects the color in halfway in between the two. For example, I could select the color #000000 ( Pitch black ) along with #ffffff ( Pure white) and it would end up with #828282, which is the color in between the two on the same spectrum.
For a way to implement this, you could imagine two dots on the same color from the RGB bar below the picker, and draw a line between the two. The middle of that line is what it picks.
This is just something that I feel would be a lot better than eyeballing it- but nothing personal if you decide not to use it.