Would this work for the style and tone of your text:

"Advertising - the silver lining"

"Every cloud has a silver lining" is an extremely well-known saying:
http://tinyurl.com/4f6gjl

I've checked and it seems to be equally common currency in the USA:
http://tinyurl.com/3jhy63

in Canada:
http://tinyurl.com/4ceajm

in Australia:
http://tinyurl.com/4mzyhj

and in New Zealand:
http://tinyurl.com/43lbwa ;

and I'd venture to say that people seeing/hearing the phrase "a/the silver lining' will make that immediate association

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Note added at 1 hr (2008-09-22 12:06:11 GMT) Post-grading
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Thank you! However, please forgive me if I say that it's a good idea to follow the ProZ rules and wait 24 hours before you close a question. Who knows if there isn't another suggestion out there which might suit your purposes even better?
However, for all that, I'm glad to have been able to help! Good lick!