WinRT Universal App: Bottom bar icons blurred. - windows-runtime

I have used 76*76 png file for bottom bar icon in my windows universal app.
Below is my xaml for mobile bottom bar
<Page.BottomAppBar>
<CommandBar RequestedTheme="Dark" Background="#FFF3A716">
<AppBarButton x:Uid="AppBarHome" Click="AppBarButton_Click">
<AppBarButton.Icon>
<BitmapIcon HorizontalAlignment="Center" VerticalAlignment="Center" UriSource="/Assets/Images/home-icon.png">
</BitmapIcon>
</AppBarButton.Icon>
</AppBarButton>
</CommandBar>
</Page.BottomAppBar>
And this is my bottom bar for tablet app:
<Page.BottomAppBar>
<CommandBar Name="BtmBar" Closed="CommandBar_Closed" RequestedTheme="Dark" Background="#FFF3A716" IsOpen="True" IsSticky="True">
<AppBarButton x:Uid="AppBarHome" Click="AppBarButton_Click">
<AppBarButton.Icon>
<BitmapIcon HorizontalAlignment="Center" VerticalAlignment="Center" UriSource="/Assets/Images/home-icon2.png">
</BitmapIcon>
</AppBarButton.Icon>
</AppBarButton>
</CommandBar>
</Page.BottomAppBar>
home-icon is 76*76 and home-icon2 is 96*96.
I have tried 76*76 icon for both also but in phone it seems ok and in tablet it is blurred.
How can I get rid of this blurry issue?

You have to make more than one scale and let Windows -auto- choose the perfect one .. This image may help you : http://i.stack.imgur.com/x2yGW.jpg .
Ref: AppBar button icon not fitting inside elipse
Scaling Ref : How to create multi scaled image assets for a WP 8.1 Store app

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This is my code XAML, i just want to change background color of the labels and buttons inside
<Page.BottomAppBar>
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The AppBar is system UI and you are not allowed to change colors of individual buttons. If you want you can change the backgrounf color of whole application bar (use Background property) and color of all buttons (use Foreground property). This should work:
<Page.BottomAppBar>
<CommandBar Background="#FF3965FF" Foreground="White">
<AppBarButton Label="estação" Icon="Map" Click="Bar_Localizar"/>
</CommandBar>
</Page.BottomAppBar>
Remember also to perform suitable changes for all themes (Light/Dark/Contrast) allowed by your app.
If you need something more customizable, then probably you will have to build own control that will mimic the AppBar.

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I am working on a winrt universal application, question is specifically for windows phone project.
UPDATED:
Actually I am using component one library, and for some reason I want to use its richtextbox control just like a richtextblock. Below is xaml:
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Here's my relevant code:
ViewModel
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<ListBox.ItemsPanel>
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<ListBox.ItemTemplate>
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Here's a good article that outlines exactly how to implement an image carousel for Windows Phone 8.1. http://www.captechconsulting.com/blogs/windows-81-image-carousel

Get the effective backcolor of app bar in WP8

I'm trying to implement a custom popup menu for one of my app bar icon button (something like the PhoneFlipMenu tool). I'm using a vertical StackPanel for that:
<StackPanel x:Name="popupMenuListCommands" Grid.Row="1"
Orientation="Vertical" VerticalAlignment="Bottom"
Background="{StaticResource PhoneDisabledBrush}"
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<TextBlock Text="menu item 2" Style="{StaticResource PopupMenuListCommand}" />
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void appBarIconButtonList_Click(object sender, EventArgs e)
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App bar uses a default phone color according to the theme. So, instead of using the app bar color why not use the default theme color? That will also do the same. http://www.jeff.wilcox.name/2012/01/phonethememanager/ this will help you.
For dark theme the color is rgb (31, 31, 31).
For light theme the color is rgb (221,221,221).
Hope this helped.
Cheers
You can get the application bar color from the app resource named "PhoneChromeBrush".
So all you need to do is set the stack panel background to this brush.
<StackPanel x:Name="popupMenuListCommands" Grid.Row="1"
Orientation="Vertical" VerticalAlignment="Bottom"
Background="{StaticResource PhoneChromeBrush}"
Visibility="Collapsed">
<TextBlock Text="menu item 1" Style="{StaticResource PopupMenuListCommand}" />
<TextBlock Text="menu item 2" Style="{StaticResource PopupMenuListCommand}" />
This way you don't have to worry about the phone dark or light theme.