This card looks very pretty as it comes out of the envelope. Take your cue from the fabric you use as to how to decorate the rest of the card.
You will need:
A card blank
Christmassy patterned fabric
Stickers or die-cut shapes (or any other decoration you like)
Patterned edged scissors (we used simple pinking shears)
Cut a fancy edge on to your fabric. Glue the fabric to the card so it is on the folded edge side and the patterned edge sits in the middle of the card. Trim around the edge of the card to remove any excess fabric.
Decorate the outside edge of the card with stickers or pre-cut shapes or any other decoration you like.