This ad uses a concept that can easily be replicated in presentation slides. Find a silhouette of let's say a shark, and fill it with small gold fish shapes and you're done.
I used something like this once to show how small individual components of an information security architecture can create a formidable defense against cyber crime if they coordinate their activities well.
A larger image can be found on Ads of the World.

If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam, or you can follow Jan on Twitter to never miss a thing.