So I just recently started to work on the design for our STD's. We won't be sending them out for a few more months but it did get me thinking. (We are doing magnetic ones, and will be putting them into Christmas cards when mailing them out) I got to thinking since I'm inviting about 10 co-workers, give or take along with their dates. Would it be rude to just pass out the Christmas card at work with the STD's in it? Or should I still mail them to their homes. I was thinking about passing them out just to save a little extra money on stamps and what not.
(My mom's best friend for her wedding last year mailed out all the christmas cards with her STD's including to the co-workers house)
Just curiosity is all

Advice?
Thanks!