Create a background image for a mobile app

I need a background image similar to the example in the attachment but with the logo and the website in mind. size is : 640 x 1096 Budget max $10,- website:[login to view URL] Work with dark blue on the top and mild yellow in the middle - see website:[login to view URL] colour setup. Below by the text change the color to the same color as the icon in the attachment with the text "ATV Altijd een goed idee..!!!"