I’ve seen this on pinterest. We loved it! Two washing up liquid bottles some food colouring and a very happy small boy. 
Note ‘nk’ was Thursday’s sound at school! (He’s also done sh th ch ng I suppose any practice is good, right?) We might try other colours another day if the snow lasts!!!
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I think they’re gorgeous, and it’s an unbelievable surprise. I remember stomping little hearts and stars and messages like “I Love Michael Tucker” (well, I did) into the snow, then quickly running over everything so no one could see the message. Imagine channeling that same instinct, but leaving it as art for everyone to see? It’s the kind of thing you wish you could fly over. I wonder what the geese think.