Various improvement :)

qml/styles/CustomBorder.qml

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+// Author : Amit Tomar
+// @ https://stackoverflow.com/questions/16534489/qml-control-border-width-and-color-on-any-one-side-of-rectangle-element#16562823
+import QtQuick 2.4
+
+Rectangle
+{
+    property bool commonBorder : true
+
+    property int lBorderwidth : 1
+    property int rBorderwidth : 1
+    property int tBorderwidth : 1
+    property int bBorderwidth : 1
+
+    property int commonBorderWidth : 1
+
+    z : -1
+
+    property string borderColor : "white"
+
+    color: borderColor
+
+    anchors
+    {
+        left: parent.left
+        right: parent.right
+        top: parent.top
+        bottom: parent.bottom
+
+        topMargin    : commonBorder ? -commonBorderWidth : -tBorderwidth
+        bottomMargin : commonBorder ? -commonBorderWidth : -bBorderwidth
+        leftMargin   : commonBorder ? -commonBorderWidth : -lBorderwidth
+        rightMargin  : commonBorder ? -commonBorderWidth : -rBorderwidth
+    }
+}

qml/styles/Theme.qml

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+pragma Singleton
+import QtQuick 2.4
+
+Item {
+    readonly property color claret              :   "#77172A"
+    readonly property color raisin_black        :   "#AE2B25"
+    readonly property color steel_blue          :   "#462C98"
+    readonly property color twilight_lavender   :   "#754888"
+    readonly property color eerie_black         :   "#191716"
+}

qml/styles/qmldir

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+CustomBorder 1.0 CustomBorder.qml
+singleton Theme 1.0 Theme.qml