Here is a custom style that changes the look and feel of the tabs (TabItems) in the corresponding window.
[XAML]
<Style TargetType='TabItem'>
<Setter Property='BorderThickness' Value='3'/>
<Setter Property='BorderBrush' Value='Red'/>
<Setter Property='Background' Value='LightBlue'/>
<Setter Property='VerticalContentAlignment' Value='Center'/>
<Setter Property='HorizontalContentAlignment' Value='Center'/>
<Setter Property='Template'>
<Setter.Value>
<ControlTemplate TargetType='{x:Type TabItem}'>
<Border>
<Grid>
<Grid>
<Border CornerRadius='3,3,0,0' Background='{TemplateBinding Background}'
BorderBrush='{TemplateBinding BorderBrush}'
BorderThickness='{TemplateBinding BorderThickness}'/>
</Grid>
<Border BorderThickness='{TemplateBinding BorderThickness}'
Padding='{TemplateBinding Padding}'>
<ContentPresenter ContentSource='Header'
HorizontalAlignment='{TemplateBinding HorizontalContentAlignment}'
VerticalAlignment='{TemplateBinding VerticalContentAlignment}'/>
</Border>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This is how the tabs look with the above style applied on them:
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