Figured out something that could work on Nunu's ultimate

http://orig10.deviantart.net/c4e1/f/2012/039/3/0/nunu__s_wrath_by_numberslayer-d4p216i.jpg

2 things

Either Willump uses a might Spiraling frosty gale to knock his enemies to the center

Or two nunu can shoot his E snowball as a skillshot instead of a targeted ability while Willump is channeling his ultimate the snowballs woudnt do much damage but instead it would be focused on slowing, disrupting the enemy

Well that was my crazy idea may it sink into the abyss of the rito forums! mehehehehehe