I recently installed Win10 Home on my laptop, and the only color choices I have for the accent are a set of about 50 color swatches, all of which are pretty garish. This tutorial shows an option to set color with HSB, which I used in the past in 8.1, but those options are absent in 10. I tried setting the desktop to the color I wanted for the taskbar and selecting "Automatically pick an accent color from my background" but all that did was set the color to be the color swatch closest to the color I was using.