Colour_Animation.xaml

<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Background="Red">
    <Canvas.Triggers>
        <EventTrigger RoutedEvent="Canvas.Loaded">
            <BeginStoryboard>
                <Storyboard TargetProperty="Background.Color">
                    <ColorAnimationUsingKeyFrames RepeatBehavior="Forever">
                        <LinearColorKeyFrame KeyTime="0:0:0" Value="Red" />
                        <LinearColorKeyFrame KeyTime="0:0:1" Value="Orange" />

                        <LinearColorKeyFrame KeyTime="0:0:7" Value="Red" />
                    </ColorAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Canvas.Triggers>
</Canvas>