Make the freezing effect when stepping into snow blocks a applicable effect

I think the freezing effect should be applicable to the player in some way via commands, which will be useful for mapmaking, just imagine you start up a Christmas themed Minecraft map, and as soon as you step out of your house ingame you start to get the freezing effect showing, with little snowflakes on the side of your screen to enhance the map, or you're playing as an enemy mob(snowman) and you have the freezing effect with the blue hearts.