I actually have used this app for about two years now, and still one of the most recommended app. It basically selects colours from a chosen image, either from your library or a photo just snapped, and composes a palette from those colours.
And of course I don't want the colour of the dry wall in my palette, or that many colours. The pipettes can be relocated, and you can choose to delete the unwanted colours from a saved palette.
Also, when one colour is selected, the usual colour schemes are provided. And all of these can be sent to emails.