Photographs of strange alien "iceballs" in Victoria Park

I think they are UFO's - Unidentified Frozen Objects?

How about feces from alien ice giants?

Anything "alien" would've melted while falling from space, burst in the atmosphere from air friction, or shattered on impact. Even space rocks seldom make it to the ground, and preciuos little of them remains.

I think, given their soil-smeared aspect, they've probably been made by the wind rolling an original nucleus/object on the ground, creating low density snowballs.

Just my amateurish hypothesis, I'm no meteorologist.

Definitely an unusual phenomenon anyway. Must've been some pretty strong whirling winds, and probably lasting ones to roll some of the biggest balls.

Either I am missing the Joke here, or people in London really do not understand what happens when kids and snow mix.

With in hours of any snowfall here in Canada, kids start rolling Snowballs, normally for use in building Snowmen and Women, but often just for fun.

The dirt gets picked up if the person who is rolling the snowball rolls back over a spot where all the snow has already been picked-up during rolling. Also, if the snowball becomes too heavy will pick up such a deep layer of snow, that it goes right down to the dirt.