I've a university project in which I should find and implement a proper development topic for Azure. In Azure there are Web Roles and Worker Roles and I would like to find something, that burdens **relatively big load on both roles**.

(web role is for serving the users by webpages, worker roles are for background processing data that will be displayed via the web role)

One of the goals is to show up the huge computing power of the cloud by measuring.
My problem is, I don't know any sophisticated algorithms that would make the CPUs sweat. So what would be the thing that is not too complex for implement but complex enough to be computed?

Any ideas appreciated!