Do you have anything that you could melt chocolate in, and then have the girls "coat things in chocolate"???
One thing we do - is dip Ritz crackers into melted mint-flavored chocoalte wafers...then top with "smooshed" up peppermint candies.
You can take pretzel rods, and dip about 1/3 of it into either melted white or regular chocolate, and then roll it into crushed nuts, jimmies, or any other little Christmas sprinkles.
If you melt white chocolate, spread it on a flat surface (i use a cookie sheet covered in tin-foil, and before it "sets up" you can also sprinkle either nuts, candy canes that are almost smooshed - but so that you can see it is candy canes. If you do nuts...you can also add in chopped up craisins.
One thing that is really yummy, and super easy to make is white-chocolate coated popcorn. We buy already popped pocporn from the snack aisle, and use about 1 # of white chocolate per bag of the popcorn.
I've not done this one, but have heard it is very, very good - take 2 ritz crackers, and put peanut butter on one, and use the other to make a sandwich. Dip the whole thing into a melted chocolate.
Another thing that I've heard (actually from the Disboards) that would be really fun - is to do the Oreo Truffles. There is a recipe here:
http://allrecipes.com/recipe/easy-oreo-truffles/Detail.aspx
I did a sweets/chocolate day with my Junior girl scout troop about 4 or 5 years ago - we had a lot of fun!!!
A chocolate melter - Wilotn makes one would be fun to have, if you don't have one already!
http://www.amazon.com/Wilton-Chocolate-Pro%C2%BF-Electric-Melting/dp/B000H849V6 And, if you have a 40% off coupon at Michaels, they aren't all that expensive!
Have fun - this sounds like a great time! Any way I could swing an invite???