ok now to answer the rest of the questions!

Are they edible, or just for the fun & celebration of the holiday? You both made a lot of them!!!
They are edible but really they are more for decoration. We made 24 total, so we each had 12 to decorate and give to our friends.

Out of curiousity how much sugar did it take to make all of them?
For the actual skulls we used 10 lbs of sugar! To make the royal icing which is what we used to decorate we used 4 lbs of powdered sugar.