Here are a few more ideas to share with you:
Now that you know you can recycle a Christmas card or gift card into templates, use those templates to cut shapes from old book pages.
Tip: At the end of a book sale, many times they will put the remainder of books up for free. Watch for those deals, and add them to your crafting supplies.
Add small shapes to blank paper to create homemade writing paper too.
Create a set of matching paper, cards and envelopes, and gift them any time of year.