Id get buildings that you want to match your table and existing stuff.
Go get ether baking soda or some other fake snow material and glue it on the top portions where it makes sense.
(Baking soda yellows over time)
(using white or super glue)
You can also make icicles by melting clear acrylic rods if you want to get that cold.
when painting
id add a little bit of blue or turquoise to the shade areas to add a tint of cold.
the snow on this thing i did is aluminum oxide for sand blasting.
its pure white and should be color stable for basically ever.

This stuff but apparently harbor freight no longer sells it which is a shame
dont inhale any snow products though