[XAML]

<ControlTemplate x:Key="Temp1" TargetType="{x:Type Button}">

<Grid>

<Ellipse x:Name="Ell" Width="{TemplateBinding Width}" Height="50">

<Ellipse.Fill>

<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">

<GradientStop Offset="0.3" Color="YellowGreen"/>

<GradientStop Offset="1" Color="Green"/>

</LinearGradientBrush>

</Ellipse.Fill>

</Ellipse>

<Viewbox>

<ContentControl Margin="10" Content="{TemplateBinding Content}" FontSize="11" HorizontalContentAlignment="Center" Foreground="AntiqueWhite"/>

</Viewbox>

</Grid>

</ControlTemplate>

<Button Name="Button1" Template="{StaticResource Temp1}" Height="50" Width="80">Templated Button</Button>