Make_QGIS_ColorRamp.py

# Script modified from original by Anita Graser: https://twitter.com/underdarkGIS/status/716389969850404864
# To use: Enter a paletteName, paste array of hex codes into colors, and run!
# Re-running with the same name will update the previous color ramp
############################################################################

from PyQt4.QtGui import QColor

paletteName = '' # give the palette a name
colors = [] # replace with hex values

color1 = QColor(colors[0])
color2 = QColor(colors[-1])
stops = []

ramp = QgsVectorGradientColorRampV2(color1,color2,1,stops)
tags = []

if len(colors) > 2:
    step = 1.0 / (len(colors))
    for i, color in enumerate(colors[1:]):
        stops.append(QgsGradientStop(step * (i+1), QColor(color)))
    ramp.setStops(stops)

QgsStyleV2.defaultStyle().removeColorRamp(paletteName)
QgsStyleV2.defaultStyle().addColorRamp(paletteName, ramp, 0)
QgsStyleV2.defaultStyle().saveColorRamp(paletteName, ramp, 0, tags)