get query() without post content?

If you set the fields argument to ids in your query it will return only post IDs which you can then pass to other functions to fetch the data you need. Though that may save memory at the cost of increasing queries to the database.

How to change the color theme per post?

I would agree to the comment by Howdy_McGee to use Custom Fields. A nice implementation would be possible with add_meta_box(). 1. Approach: The body_class Filter So for example, you could let him enter a custom field ‘color-scheme’. In the next step, you could simply hook into the ‘body_class’-filter and add another class to the <body>-tag … Read more