My knitting group at church, the Knitwits, has a monthly birthday lunch for members and then at Christmas time, we have another lunch party. For us with December birthdays it is a huge windfall of gifty things from everyone and really requires Thank You cards for the participants.
Since we moved, I can't find things like my box of notes, but I did find a bunch of envelopes and some sheets of bristol paper which I could cut down to fit the envelopes.
And most importantly, I do have my box of collage papers and stamps at hand. Here's some of the cards I made. So much fun!