The color picker has wonderful functionality. I especially love the gradient fills. There are however a few things that I do not like. I enter a lot of hex color values into the picker and those changes aren't enforced till I select the small color box which or click enter. 

1. If I am entering multiple values for fill colors, if I click enter. It should apply the color but not close the color picker.

2. The hover over the color pallet should not automatically update the selected color. This is a pain because I often enter a hex color value and try to click the box to apply the color and if I incorrectly hover over the bottom color boxes I lose my value that I just entered. I would recommend that the selected color be changed only when you select the color. This is how every color pallet works.