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What I got was exactly this on a white background:
My dog could've made a better ad and I don't even have a dog.
[edited by: flobaby at 2:51 am (utc) on May 5, 2005]
I suspect that most image ads come from ad agencies and corporate advertisers who wouldn't be caught dead buying text ads that look like classified ads in newspapers.
I also tried the small horizontal adsense "image & text" banner for ashort time.
Although it did appear, it didn't seem to be as visually effective as the skyscaper ad. The horizontal ad looked just like that - "a horizontal ad", whereas the skyscraper ad made you want to look at it and wonder "what on earth is is?!" - which is exactly the "clickable effect" you desire ;)