Every year, Site 3 coLaboratory http://site3.ca has a halloween party.
A few years ago, I whipped up some trophies for the costume contest with my MakerBot Cupcake. (1st, 2nd, 3rd, and a prize for oversized costumes.) I've since made more editions on my Afinia H479.
I combined Bioluminescence's Deus Ex candelabra at different sizes to create a base, and used my trusty Plastruct Bondene to weld them to different scales of akaziuna's vampire skull and Artec's celtic skull.
I normally print using ABS, which means that I can use Plastruct Bondene or just plain acetone to weld the pieces together. If you're printing with PLA, I recommend using Gorilla Superglue.
Also, because these are trophies, it's important to crank up the infill as high as you have time for. This will give the final models a nice heft to them, so that they feel "real".