I propose a challenge of sorts, a plot-bunny if you will. I shall name it 'The Frostbite Challenge'.

Basically, just follow the ideas posted in the synopsis.

So, in short, Clint throws snowballs at Loki in Antarctica which piss the Jotun god off. In anger, Loki causes a blizzard that the avengers are trapped in. It can be narrated by any of the Avengers, preferably Stark.