https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Colors/Color_picker_tool
http://www.w3schools.com/tags/ref_colorpicker.asp?colorhex=D2B48C
http://www.w3schools.com/cssref/css_colornames.asp
http://www.colors.commutercreative.com/grid/
the color wheel selector from Adobe: