Here is an intriguing page attempting to describe a true memetic organism.

www.reciprocality.org/Reciprocality/r1/

In a nutshell, it creates and then feeds on boredom, routine, and bureaucracy...

You can find other papers by the same author by going up one directory.

It's pretty out-there but intelligently written- the central thesis seems to be that the condition we call ADHD is the natural state, and what we call normal or sane is a cultural sickness.
He classifies people into "mappers" and "packers," two opposite ways of organizing one's perception of the world- and makes a convincing argument that the former is more valuable, but our culture has been constructed to reward and reinforce the latter approach.

Anyway- all of this is debatable- I personally think it is sound but oversimplified in its focus on dopamine, there are surely other factors at work. But I like the article because it introduces a way of looking human behaviour that is unfamiliar to most.

I think this would be a good forum to speculate on other self-contained memetic organisms. Where in our society they 'live', how they reproduce, what their food sources and waste products are. Think big...