When you pull the user details from api you get:

<profile_background_color>9ae4e8</profile_background_color>
<profile_background_image_url>http://s3.amazonaws.com/twitter_production/profile_background_images/2752608/twitter_bg_grass.jpg</profile_background_image_url>
<profile_background_tile>false</profile_background_tile>

this works fine if the user chose an image background and chose to tile or
not. but if the user chooses to show solid background color ONLY. here is
no way to differentiate between the situations. 

There is no way to understand if the user decided to put solid background only.

should not return background-image if the user chose to use background
color only 'Click: Do not use this Image'.