Commission/Request Samples-Beyond Hope.

Examples of work I have done to give you an idea of what you can request for site donation gifts/commissions.
A group of website headers I did for Aruna7.  This project involved 35 collages of different promo images for film and television franchises.
The style was experimental and I wasn't sure that I would do the whole set this way, but my friend liked them, so we kept it.
A full gallery below.
For a project like this, price would be determined by the design of the website graphics and how time intensive it was.  
For a single header, $1. Customizing a blank premade header for your site is free.