Ha ha, I don't know about the icon, but I do know that such a thing would be very pleasing to me! I think the part that got me laughing, and that I still find completely hysterical, is when Cas hears "Stayin' Alive" and thinks it's women singing XD

And I have lost track of the number of times I've read Dean Teaches Castiel To Swear; it's one of those fics that never gets less funny, no matter how many times you read it. I swear, every time I get to the end and Castiel comes out with... what he comes out with, I imagine him saying it in Misha's slightly menacing monotone, and I die. I just die.

Castiel: He'll smite the fuck out of shit.