diff --git a/CHANGELOG b/CHANGELOG
index 8bc5e5144d..8154a3c2d0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Allow configuration of default colors for graph and calendar
 * Use existing context for get_preferences
 * Add context to export URL
 
diff --git a/tryton/config.py b/tryton/config.py
index a01e8652e5..2ad91e2491 100644
--- a/tryton/config.py
+++ b/tryton/config.py
@@ -57,6 +57,8 @@ class ConfigManager(object):
             'client.bus_timeout': 10 * 60,
             'icon.colors': '#3465a4,#555753,#cc0000',
             'tree.colors': '#777,#dff0d8,#fcf8e3,#f2dede',
+            'calendar.colors': '#fff,#3465a4',
+            'graph.color': '#3465a4',
             'image.max_size': 10 ** 6,
             'bug.url': 'https://bugs.tryton.org/',
             'download.url': 'https://downloads-cdn.tryton.org/',
diff --git a/tryton/gui/window/view_form/view/calendar_gtk/calendar_.py b/tryton/gui/window/view_form/view/calendar_gtk/calendar_.py
index f5f5cbdaea..fc3f3e7539 100644
--- a/tryton/gui/window/view_form/view/calendar_gtk/calendar_.py
+++ b/tryton/gui/window/view_form/view/calendar_gtk/calendar_.py
@@ -6,6 +6,9 @@ import goocalendar
 from .dates_period import DatesPeriod
 
 from tryton.common import MODELACCESS
+from tryton.config import CONFIG
+
+_colors = CONFIG['calendar.colors'].split(',')
 
 
 class Calendar_(goocalendar.Calendar):
@@ -14,6 +17,9 @@ class Calendar_(goocalendar.Calendar):
     def __init__(self, attrs, view, fields, event_store=None):
         super(Calendar_, self).__init__(
             event_store, attrs.get('mode', 'month'))
+        self.props.selected_border_color = _colors[1]
+        if hasattr(self.props, 'selected_text_color'):
+            self.props.selected_text_color = _colors[0]
         self.attrs = attrs
         self.view_calendar = view
         self.fields = fields
@@ -69,10 +75,10 @@ class Calendar_(goocalendar.Calendar):
         return domain
 
     def get_colors(self, record):
-        text_color = None
+        text_color = _colors[0]
         if self.attrs.get('color'):
             text_color = record[self.attrs['color']].get(record)
-        bg_color = 'lightblue'
+        bg_color = _colors[1]
         if self.attrs.get('background_color'):
             bg_color = record[self.attrs['background_color']].get(
                 record)
diff --git a/tryton/gui/window/view_form/view/graph_gtk/graph.py b/tryton/gui/window/view_form/view/graph_gtk/graph.py
index 1b812e686f..a854d30ac3 100644
--- a/tryton/gui/window/view_form/view/graph_gtk/graph.py
+++ b/tryton/gui/window/view_form/view/graph_gtk/graph.py
@@ -14,6 +14,7 @@ from gi.repository import Gdk, Gtk
 import tryton.rpc as rpc
 from tryton.action import Action
 from tryton.common import hex2rgb, generateColorscheme, COLOR_SCHEMES
+from tryton.config import CONFIG
 from tryton.gui.window import Window
 from tryton.pyson import PYSONDecoder
 
@@ -460,7 +461,7 @@ class Graph(Gtk.DrawingArea):
 
     def setColorScheme(self):
         keys = self._getDatasKeys()
-        color = self.attrs.get('color', 'blue')
+        color = self.attrs.get('color', CONFIG['graph.color'])
         r, g, b = hex2rgb(COLOR_SCHEMES.get(color, color))
         maxcolor = max(max(r, g), b)
         self.colorScheme = generateColorscheme(color, keys,