Stick Men or similar.
Simple, black and white drawings, caricatures, etc.
These are for a portal site and the budget is not big.
Does not have to be fancy, just needs to be "on theme" for the site.
Because the header is so big, the content of the header should cover most of the header area but not appear "too busy".
Finished product shall be 940 X 198 pixels and the theme is as follows:
1-Affiliate Services-Can be a stick man holding a food service tray or similar and accompanying items.
2-Article writing-Pens, pencils, giant pencil used by stick man coaching (article coaching), etc.
3-Back Linking-Back Links flowing or flying from a portal, etc.
4-Auto blogging or blog automation- A machine spurting out blogs, etc
5-Keyword research-Stick man with a microscope or similar
6-Advanced niche sites- Construction <<<<< of sites by hand, can be construction worker stick man, etc
7-For the main header, the idea should focused on personal affiliate mentor ship.
So, that is 7 headers in total, with simple, thematic stick men (or similarly simple) drawings as the graphics.