diff --git a/CHANGELOG b/CHANGELOG
index 136c172b58..02050c6681 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Allow configuration of default colors for graph and calendar
 * Sanitize RichtText fields content (issue9405)
 * Escape external string (issue9394)
 * Keep context in sessionStorage
diff --git a/src/common.js b/src/common.js
index fdc8ee4cb3..c2aafa0238 100644
--- a/src/common.js
+++ b/src/common.js
@@ -3673,4 +3673,100 @@
             });
     };
 
+    Sao.common.COLOR_SCHEMES = {
+        'red': '#cf1d1d',
+        'green': '#3fb41b',
+        'blue': '#224565',
+        'grey': '#444444',
+        'black': '#000000',
+        'darkcyan': '#305755',
+    };
+
+    Sao.common.hex2rgb = function(hexstring, digits) {
+        digits = digits || 2;
+        var top = parseInt('f'.repeat(digits), 16);
+        var r = parseInt(
+            hexstring.substring(1, digits + 1), 16);
+        var g = parseInt(
+            hexstring.substring(digits + 1, digits * 2 + 1), 16);
+        var b = parseInt(
+            hexstring.substring(digits * 2 + 1, digits * 3 + 1), 16);
+        return [r / top, g / top, b / top];
+    };
+
+    Sao.common.rgb2hex = function(rgb, digits) {
+        digits = digits || 2;
+        var top = parseInt('f'.repeat(digits), 16);
+        return '#' + rgb
+            .map(function(i) { return Math.round(i * top).toString(16); })
+            .join('');
+    };
+
+    Sao.common.rgb2hsv = function(rgb) {
+        var r = rgb[0],
+            g = rgb[1],
+            b = rgb[2];
+        var maxc = Math.max.apply(null, rgb);
+        var minc = Math.min.apply(null, rgb);
+        var v = maxc;
+        if (minc == maxc) return [0, 0, v];
+        var s = (maxc - minc) / maxc;
+        var rc = (maxc - r) / (maxc - minc);
+        var gc = (maxc - g) / (maxc - minc);
+        var bc = (maxc - b) / (maxc - minc);
+        var h;
+        if (r == maxc) {
+            h = bc - gc;
+        } else if (g == maxc) {
+            h = 2 + rc - bc;
+        } else {
+            h = 4 + gc - rc;
+        }
+        h = (h / 6) % 1;
+        return [h, s, v];
+    };
+
+    Sao.common.hsv2rgb = function(hsv) {
+        var h = hsv[0],
+            s = hsv[1],
+            v = hsv[2];
+        if (s == 0) return [v, v, v];
+        var i = Math.trunc(h * 6);
+        var f = (h * 6) - i;
+        var p = v * (1 - s);
+        var q = v * (1 - s * f);
+        var t = v * (1 - s * (1 - f));
+        i = i % 6;
+
+        if (i == 0) return [v, t, p];
+        else if (i == 1) return [q, v, p];
+        else if (i == 2) return [p, v, t];
+        else if (i == 3) return [p, q, v];
+        else if (i == 4) return [t, p, v];
+        else if (i == 5) return [v, p, q];
+    };
+
+    Sao.common.generateColorscheme = function(masterColor, keys, light) {
+        if (light === undefined) {
+            light = 0.1;
+        }
+        var rgb = Sao.common.hex2rgb(
+            Sao.common.COLOR_SCHEMES[masterColor] || masterColor);
+        var hsv = Sao.common.rgb2hsv(rgb);
+        var h = hsv[0],
+            s = hsv[1],
+            v = hsv[2];
+        if (keys.length) {
+            light = Math.min(light, (1 - v) / keys.length);
+        }
+        var golden_angle = 0.618033988749895;
+        var colors = {};
+        for (var i = 0; i < keys.length; i++) {
+            var key = keys[i];
+            colors[key] = Sao.common.rgb2hex(Sao.common.hsv2rgb(
+                [(h + golden_angle * i) % 1, s, (v + light * i) % 1]));
+        }
+        return colors;
+    };
+
 }());
diff --git a/src/sao.js b/src/sao.js
index ebc54449aa..1218c6d770 100644
--- a/src/sao.js
+++ b/src/sao.js
@@ -282,6 +282,8 @@ var Sao = {};
     Sao.config.bug_url = 'https://bugs.tryton.org/';
     Sao.config.title = 'Tryton';
     Sao.config.icon_colors = '#3465a4,#555753,#cc0000'.split(',');
+    Sao.config.calendar_colors = '#fff,#3465a4'.split(',');
+    Sao.config.graph_color = '#3465a4';
     Sao.config.bus_timeout = 10 * 60 * 1000;
 
     Sao.i18n = i18n();
diff --git a/src/view/calendar.js b/src/view/calendar.js
index b0cfb5e9ed..51ae25784b 100644
--- a/src/view/calendar.js
+++ b/src/view/calendar.js
@@ -97,12 +97,12 @@
         },
         get_colors: function(record) {
             var colors = {};
-            colors.text_color = 'black';
+            colors.text_color = Sao.config.calendar_colors[0];
             if (this.attributes.color) {
                 colors.text_color = record.field_get(
                     this.attributes.color);
             }
-            colors.background_color = 'lightblue';
+            colors.background_color = Sao.config.calendar_colors[1];
             if (this.attributes.background_color) {
                 colors.background_color = record.field_get(
                     this.attributes.background_color);
diff --git a/src/view/graph.js b/src/view/graph.js
index 22a1056eda..e388c6cb09 100644
--- a/src/view/graph.js
+++ b/src/view/graph.js
@@ -84,9 +84,10 @@
             var fields2load = [this.xfield.name];
             for (i = 0, len = this.yfields.length; i < len; i++) {
                 yfield = this.yfields[i];
-                data.columns.push([yfield.name]);
-                data.names[yfield.name] = yfield.string;
-                key2columns[yfield.key || yfield.name] = i + 1;
+                key = yfield.key || yfield.name;
+                data.columns.push([key]);
+                data.names[key] = yfield.string;
+                key2columns[key] = i + 1;
                 fields2load.push(yfield.name);
             }
 
@@ -207,17 +208,28 @@
                     }
                 };
             }
-            var colors = {};
-            for (var i = 0; i < this.yfields.length; i++) {
-                var field = this.yfields[i];
-                if (field.color) {
-                    colors[field.name] = field.color;
+            var color = this.view.attributes.color || Sao.config.graph_color;
+            var rgb = Sao.common.hex2rgb(
+                Sao.common.COLOR_SCHEMES[color] || color);
+            var maxcolor = Math.max.apply(null, rgb);
+            var keys = [];
+            var i, yfield;
+            for (i = 0; i < this.yfields.length; i++) {
+                yfield = this.yfields[i];
+                keys.push(yfield.key || yfield.name);
+            }
+            var colors = Sao.common.generateColorscheme(
+                color, keys, maxcolor / (keys.length || 1));
+            for (i = 0; i < this.yfields.length; i++) {
+                yfield = this.yfields[i];
+                if (yfield.color) {
+                    colors[yfield.key || yfield.name] = field.color;
                 }
             }
             c3_config.data.color = function(color, column) {
                 // column is an object when called for legend
-                var name = column.id || column;
-                return colors[name] || color;
+                var key = column.id || column;
+                return colors[key] || color;
             };
             return c3_config;
         },