If you download the image below, you could add it as a custom colour picker.
This only really works if the colour picker is set to HS/L mode.
To do this, click on the current colour at the bottom right of the picker and choose HS/L Picker from the list.
Now add the custom colour picker like this:
Click the current colour at the bottom right of the picker and choose 'Custom Colour Pickers'
The custom colour picker panel will open.
Choose a group to add the new picker on the left ( I just chose 'Pickers )
Click the 'Import Picker' button then browse to the image file you downloaded ( Cellular Picker.png ), select it and choose 'Open'
You should then see it added to the current custom picker group.
Click it and close the panel.
This was made using a similar method to the one Roma Golich described.
I took a screenshot of the colour picker, pasted it into Irfanview, cropped it then reduced the colour depth
I hope this is of some help!
EDIT: Replaced image with a better version