UPDATE: Although the answers below were correct, I ended up resolving the issue by editing the stylesheet to refer to those specific locations.
If I create a custom field and set it to hidden, is there any way I can call the values from those specific fields in the body?
For example if a field called color in an article is set to red, is there any way I can make the background of a div red.
Try what I suggested here: Getting a field's value from an entity
Replace field_get_items('entityform', $entityform, 'field_myfieldname')
with
field_get_items('node', $node, 'field_myfieldname')
Two methods I can think of. One is to use hook_nodeapi and catch the events of getting saved or viewed. Change the body field accordingly. You can also use hook_node_view.
I assume you want to change the bg of body field. Second easier way is to a use Computed Field. Now add two computed fields named "pre" and "post". Set "pre" to before body and "post" after body in the content "Manage Display"( pl. see the attachment).
In the condtional field "pre" insert the PHP code to take out color field value and print something like: "print ".
In the "post" field close the div tag: "print ""
I suggest you go through any simple Drupal book to get you started with the basics or do a course at Lynda.com.
You can always come back here and ask any question in case you have any query or need help in coding etc.
