For all the Ronnie Mund fans! The Flat Ronnie phenomenon has already gone worldwide! Now you can put Flat Ronnie in your photos's in this awesome app! Where will Ronnie appear next? NEW FEATURE. Resize Flat Ronnie to any size you wish. make him big or small to fit in perfectly with your photos. Make sure to post your creations to Twitter with the hashtag #FlatRonnie.