Flipboard does quite a good job of grabbing content from multiple sources of your choice and displaying them in an attractive format. It's not a homescreen thing, but that's probably for the best. Do you really want non-urgent things shoved in your face constantly?
Google Now has the most useful approach here, and I'm eager to see that developed even further. If you could populate it with selected RSS feeds, that would be nice.
Flipboard does have a Daydream mode, where you can let it take the screen over whenever your Android device is docked or charging (you decide which, or both)
This way essentially Flipboard-formatted RSS becomes your screen saver.
The HTC One UI has an interesting feature for the default home screen that many compare to Flipboard called BlinkFeed. Choices of news feeds are limited and controlled, but it shows lots of promise in terms of attractive formatting and pulling in content from various social nets & news sources with tight integration with the social apps on your phone. (ala updating/replying/reposting something from home screen)
Google Now has the most useful approach here, and I'm eager to see that developed even further. If you could populate it with selected RSS feeds, that would be nice.