My favorite party favor of all time is the tetra pak because it's quick & easy to make, has an unusual surface area for design, and holds a surprising amount of treats.
4 ghosts fill up a sheet of 8.5x11 inch paper efficiently, so there's very little waste. Remember to print "Fit to Page" so it maximizes the printing area.
1) You will need also need scissors, 1/8" hole punch, double-sided tape, and about 6 inches of 1/8" width ribbon.
2) Flip over the ghost. Place double-sided tape along the left edge and along the top right as shown by the arrows. Remove a small portion of the wax along the left and fold it down (do not remove all the wax yet).
3) Keeping your fingers on the waxed portion, roll the ghost into a tube, overlapping the gray diagonal lines. When it's aligned and straight, press the exposed adhesive. Gently pull more wax off, then press to adhere. Repeat until you have a completed tube.
4) Remove all the wax from the end of the tube.
5) Guided by the small gray line, pinch the top end closed.
6) Guided by the two small gray lines at the bottom end, pinch closed, then fold the end over toward the back. Unfold and fill with treats.
7) Punch a hole in the bottom middle. Fold your ribbon in half and thread it through partway. Take the ribbon ends and thread it through the folded ribbon, then pull until taut.
8) You're ready for a boo-tyful night of tricks and treats!
If you'd like to have this pattern, please leave your email in a comment (hope you'll follow my blog) and I'll email you a PDF download link to make your own. If you'd like to make your own for a wedding or other occasion, I have a template and examples in a previous DIY post: http://paperzen.blogspot.ca/2011/01/diy-party-favor.html
If you really enjoyed making this pattern and would like to make more, I have 4 more patterns (witch, mummy, candy corn, and frankenstein) in my Etsy store.