I have a 1,080px by 270px area at the top of our site/blog/forum that i use to randomly display images linked to our blog posts. Not for actual 3rd party ads or anything.
CURRENTLY I have it divided into 4 equal square divs 270px each. Then each one has a different ad zone assigned. I have purchased an expensive ad server subscription to push the ads randomly to each of the squares each time a page is loaded. I have it setup to never display the same ad at the same time obviously. BUT, the biggest reason I paid an adserver was because every 10 page loads or so I like it to display one large/wide banner across then entire thing. I do this by slicing the one wide image up into 4 via photoshop and then assigning each square of the image into zone 1, zone 2, zone 3, zone 4 and then using a companion restriction so that if one of the images pop up it automatically loads the other 3 matching ones into their zones giving me one wide banner image.
I think this is really cool but it's very costly each month and a pain in the butt. Is there any easier way to get this same type functionality but without having to pay for an adserver since I'm not really serving 'ads'?