A handmade card can be constructed of anything you may have in your craft trunk!
You can use paper bags from a gift shop or boutique, you can use wrapping paper scrap or even an old post card with a decorative hole punch.
You can make a card out of anything that isn't "glued down"! ;)
Here is an example of an Easter/Spring Card in square format using tablet card stock/tablet paper/wrap-scrap and one single stamped image (the butterfly) accented with PrismaColor pencils and clear glitter-gel pens by Sakura.
Hope you enjoy!