Use a glass container, any glass container, even a round fish bowl! Place artificial snow ( or salt ) at bottom for the base. Add some greenery from the outdoors with the artificial birds and nest from a craft store or garden shop.
“ Flower-shop, Brussels, designed by Paul Hankar, XIX century. ” This is literally the perfect, most fitting sort of thing to put in the window of an Art Nouveau front like this. One of the things I enjoyed about Brussels was the Art Nouveau.