I do remember one issue of Moon Knight (don't know if it was in the main series or not) where he already started going more abstract. "Hit it!" IIRC, the main story itself was still his older style, but the backgrounds were children's drawings.
There is a nice thread on the Marvel board right now BTW on artists with more stylized styles (Even though there is no discussion, just posting lots of pictures of different artists).
Back on topic:
All in all, I think the "Image" Artist Era was an important piece of comic evolution. The very first Image comics did lack substance and pushing other artists to draw in a style aping Liefeld or Lee (though again, I think that the styles of Liefeld, McFarlane and Lee are not comparible, not even speaking of the relative talents of these individuals which also differs greatly.) was a stupid idea, it finally lead to some fine comic companies and seeing early 2000s Wildstorm or the current line-up at Image Comics, I think it was worth it.