I guess I could plug a silly little script I wrote for GreaseMonkey which runs on facebook.com. I hated looking at the "Trending" and "Recommended Pages" sidebar so I axed them out in favor of random imgur images of your favorite subreddit. By default you'll get `/r/aww` but you can flip it with a fixed little box in the top right to whatever floats your boat.

Full disclaimer: I'm a horrid at javascript, and the result below is mainly due to a lot of copy paste from various internet sources.

https://gist.github.com/GrahamBlanshard/d7211436088e0159164a