WPF introduces the concept of lookless controls.
Using Templates it is possible to change the appearance of a control. For examples it is possible for a ListBox to contain the Photos of employees instead of the usual List Items.
I am going to demonstrate creating a simple Template whereby a button will appear as a blue rectangle.
Silverlight Tags
<UserControl x:Class="ButtonTemplate.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<Button Height="50" Width="75">
<Button.Template>
<ControlTemplate>
<Rectangle Fill="LightBlue"/>
</ControlTemplate>
</Button.Template>
</Button>
</Grid>
</UserControl>
Result
As shown in the output the button can respond to click event as expected.
Now lets create an ellipse button.
Result
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