Thanks for all the nice replies! I'll try to answer some of your questions.

How big are they?
About the size of a baseball.

Do you give them out at Halloween?
These are actually to celebrate Dia De Los Muertos (Day of the Dead) an important holiday in many Latin American cultures. I made a thread explaining a little about the holiday which can be found by clicking here

you mush share the recipe & where you got the moulds. I'd LOVE to make those next year
Pretty much all I used was sugar and meringue powder. The molds I was able to find locally, but this website has everything that you need.
http://www.mexicansugarskull.com/mexicansugarskull/