Basically, clutter up the page more? Facebook has no background, nor do Yahoo! (front page) or Reddit (sidebar). Bing's and Yahoo!'s SERPs and Reddit's sponsored link are near Google's in terms of contrast and signage. Although Reddit opts for a border but conflates ad space with space that is used to promote results algorithmically, because it's not sufficiently confusing I guess. In terms of HN darlings, DuckDuckGo is actually worse (approximately the same contrast, "Sponsored result" doublespeak rather than just calling a spade a spade). You're asking Google to follow a standard of behavior that none of the other major sites I visit reach.
In terms of industry norms, Google is about as good as it gets. Maybe you feel that's not enough, and I guess that's a qualitative judgment that you're free to make. People will differ on things like this occasionally :P. I'd ask for some kind of harm analysis at the very least before I accept that there's anything untoward going on.
In terms of industry norms, Google is about as good as it gets. Maybe you feel that's not enough, and I guess that's a qualitative judgment that you're free to make. People will differ on things like this occasionally :P. I'd ask for some kind of harm analysis at the very least before I accept that there's anything untoward going on.