Randowiki - Random wikipedia articles
Press the spacebar and you'll get a random word to be looked up on Wikipedia and then see which article is chosen based on that word! And then, every 5 seconds, a new word is chosen and a new article unleashed!
Any articles that have images should have an image in the app.
Oh yea, if you visit the base link: https://www.mediawiki.org/wiki/API:Main_page They have a few different versions of their API and there are tons of customization options. They even have an API Sandbox where you can play around with the various query parameters and see the results in an easy to use format. I thought it was really nifty!