title: User uploaded backgrounds?
body: <p>I'd like for users to be able to upload images to use as their backgrounds on their profiles (users#show). Viewing source of some sites that have that functionality (e.g. Twitter), it seems that users are assigned an html body tag and the corresponding CSS background-image for that body tag is linked to the image they have uploaded. </p>
  
  <p>Any ideas of how I can do this? 
  (Note: I am currently using paperclip for image upload, but will integrate that with an Amazon S3/similar service) </p>
  
  <p>I thought about injecting a ruby instance variable to a CSS file/script from my users controller so that it would be dynamic, but I don't know if this is even possible. There's probably a better way.</p>