I love the glitter cardstock which enables me to make sparkling and festive cards. At Christmastime, I can jewel the cards and really amp up the "WOW!" factor.
This year, I used my mother's old sheet music from when she was a young adult to craft a themed series of cards with sheet music trees and embossed snowflakes. I have the eight cards available for purchase at modest prices - $3 or $4 a piece plus shipping - set up at my desk like a mini gallery. I have also used red and green pipe cleaners on the packaging.