sspanzer, firstly welcome to the forums!
next, while i have seen several 1/72 scale d-day dios, i havent seen any yet of the battle of the bulge. my first concern would be where you would get decent figures for the dio, as most of them in that scale are soft plastic and don't take paint of glue well. vehicles on the other hand can be found fairly easily in that scale and can be configured to match the versions used in the battle.
for ideas, you could do something in a town, in a field, a hilly area, and/or forested area. finding and making good trees in that scale though is difficult, so i'd stick with a town or field diorama. verlinden and custom dioramics among other companies make good 1/72 scale buildings. you can find them on one of the many interent model vendors. you could also make your own. there was an article in FSM awhile back on making buildings using wood, spackle, and other materials. you could do U.S. infantry in line, or on the march, and something similar for the germans and their armor. you could even try working on patton's drive to bastogne.
specifically with snow, a lot of guys use baking soda. what you're looking for is a white powder that doesn't harden smooth when glued or applied to something, and is fine enough to look like snow in that scale.
as for pics of reference, i havent donw much about the bulge, so the best advice i can give you is to do a google search on the bulge and for other info you need.
hope it helps. post up some progress as you go, and feel free to ask any more questions.