hi,
some of these are going to take work, but here goes:
*make invites in shape of "north pole sign"
*red/green/white colours
*make elf garlands (you no the paper dolls holding hands)
*giant north pole (cardboard/wood) in garden
*make your lounge into santas toy shop (not sure HOW!) with cardboard elves making toys
*white and pearlescent balloons (not sure if you can get elf ones, but if you can drw - draw onto white ones)
*make gingerbread elf cookies
*reindeer food - carrots, celery, dips
*coud you make all the kids elf hats and shoes from fabric?
*ask them to dress up as elves (stripey tights/leggins etc)
*play songs with elf/elves in - i made a cd for the boys for xmas (only has about 6 or 7 songs on it)
*a photo booth - the sort where you put your face through a hole - design of elf body etc?
*put quotes around from "elf" the movie.
*Put marshmallows in glass jars throughout (this is reminiscent of the doctor’s office, where Buddy the Elf continually ate the doctor’s cotton balls out of the jars.
*hang candy canes in the hallway?
*co-conut snowball cakes (not sure if sold in usa)
*buy or make elf badges
*cake with edible icing photo of elves
*have the elves make birthday cards and send - uk based sites like moonpig, and funky pidgeon let you customise cards/add pics and then be sent to the address (wont send to usa but u may have similar).
*have you seen this site:
http://www.orientaltrading.com/party-themes-and-events/christmas/elf-a1-388560 1240 1513-8-1.fltr
*buy normal party poppers and change labels to elf ones
**will the elves be getting up to mischief or being well behaved?
if i think of anything else will let you know.