If you have a particular topic in mind you may locate it directly by using the WARC Case Finder under the Tools tab. Alternatively you may browse the WARC database by selecting the Topics header and navigating to general area of interest.
WARC includes a ranking of the 100 most innovative or creative advertisements by year. Click on the rankings tab to access it.
Advertising campaigns are broken down into the Creative 100, the Effective 100 and the Media 100.