One way to add a background photo to any custom Tumblr theme is to embed a simple CSS tag at the right location in the theme's HTML code.

Adding a Colored Background to Posts on Tumblr. Your Tumblr theme sets the background color of each of your posts. Tumblr also offers you the option to edit your theme to further customize your ...

Following is a sampling of HTML color codes used in HTML tags for setting background and font color. Colors are coded as red, green and blue intensities in hexadecimal notation (see hex chart ...