Using native ads as banners/mrect's etc

WHAT:
Instead of using a banner or mrect and having a shitty ad company launch a full-screen ad + dialog when you request a banner (see http://forums.makingmoneywithandroid.com/advertising-networks/23953-flurry-yahoo-bullshit.html)

HOW:
Use native ads and create the banner or other format yourself. You get full control.

IMPLEMENTATION:
I did this and then posted on the Mopub forums how to do it, since it is not documented.
https://twittercommunity.com/t/single-native-ad-in-activity/44751/2

I was thinking to make same thing, however I am not sure if it complies with the policy of the ad networks.