I think this reference in The Encyclopedia Mythica is probably the closest to what I've always considered him: "Jack Frost is a figure from folklore, an elfish creature who personifies crisp, cold weather. He is said to leave those beautiful patterns on autumn leaves and windows on frosty mornings."
I saw the reference to him on Wiki that said he was the same thing as "Father Winter" - but I always saw him as more of a Fall figure than a Winter one.
I don't know if this will help at all, but I thought it was cool, so I thought I'd share it - there's a plant called Jack Frost: Brunnera macrophylla (http://www.mobot.org/gardeninghelp/plantfinder/Plant.asp?code=M800). If you click on the pic to get the close up, you can really see the traceries of the green veins that show through the white of the leaves. It really does look like frost on the leaves. Like I said, it may not help at all, but as an artist, I thought you might appreciate it.
I hope this helps some...I think it sounds like a really cool prompt, you could have all sorts of fun with it.
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I saw the reference to him on Wiki that said he was the same thing as "Father Winter" - but I always saw him as more of a Fall figure than a Winter one.
I don't know if this will help at all, but I thought it was cool, so I thought I'd share it - there's a plant called Jack Frost: Brunnera macrophylla (http://www.mobot.org/gardeninghelp/plantfinder/Plant.asp?code=M800). If you click on the pic to get the close up, you can really see the traceries of the green veins that show through the white of the leaves. It really does look like frost on the leaves. Like I said, it may not help at all, but as an artist, I thought you might appreciate it.
I hope this helps some...I think it sounds like a really cool prompt, you could have all sorts of fun with it.