Hello Ankit,
You can add a new page and then set the background in
Properties -> Template tab. You can select which template you want to use and also create an ad-hoc template which will be used only for the current page. If you do not want any content from the master page, set
Inherit Content option to
Do not inherit any content.
Details about creating a new page template can be found in
Developer's Guide.
I hope this will give you a brief summary of what you can achieve with page templates.
Best regards,
Filip Ligac