Themes enable us to incorporate actual images into the style definitions. A lot of controls use images to create a better visual appearance. We should create an Images folder within the Themes folder itself.

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<asp:image ID="Image1" 
 runat="server" Imageurl="Images/testImage.jpg" />

When the above reaches the client, the browser will be smart enough to request testImage.jpg from the App_Themes/ myTheme /Images directory (when myTheme is the selected theme).