Thank you cards question!!!?

Well, the wedding is over and it was beautiful and such a great experience!! Thanks to everyone who contributed advice over the months. My question now is: both the bridal shower and wedding are over and I wasn't able to write thank you notes in between for the shower gifts. Should I still sent 2 thank you cards to each person or consolidate into one?! I'm uming 2... Also, my coworkers threw me a shower and some of them went together to get me a giftcard. I'm not sure who actually contributed and who just came to the shower. How should I properly thank them? Thanks!