Advertising ICOs might be interesting to see. There are a few out there but a lot of them sound overly ambitious, trying to bring the entire advertisement ecosystem to the Blockchain.
MetaX (Can't find their bitcointalk post) - Quite literally rebuilding the advertisement serving platform to the Blockchain. A little too ambitious for my tastes as they're reinventing the wheel onto new technology, but it's asking a lot for a technology that is still being researched.
Brave Browser (Can't find their bitcointalk post either) - A browser built to limit ads and/or show you more relevant ads. I like that they're trying to resolve the ad problem, but it's unlikely for me to move to a new browser unless my Chrome stops working.
KR8OS (
https://bitcointalk.org/index.php?topic=2322677.0 )- Eliminating wrongly attributed ads by having public eyes decide the validity of the traffic, you don't have to be in the advertising industry to participate. They're trying to solve an actual problem and I commend them for that. Note I am employed here.