Making your own cards requires attractive paper. Instead of using something fancy from the craft store, make your own paper to use in cards. Add seeds for a decorative and useful touch---the cards then can be planted by the recipient. Make a few sheets of paper and use the extras to create plantable envelopes to go with your cards or for all-occasion stationary. While making paper is messy, it is simple enough that an older child can do it as well.
Cut a square of window screening material 2 inches larger on all sides than the wooden picture frame. Staple the screen to the frame, pulling the screen taut as you go.
Tear newspaper or other thin, nonglossy paper into 1-inch square pieces. Fill a blender half full with the paper scraps.
Add enough water to the blender so it is 3/4 full of paper and water. Place the lid on the unit and blend at high speed for one to two minutes or until the paper pulp resembles oatmeal in texture.
Hold the frame over a dish tub. Pour the pulp mixture onto the screen just until it is covered with a thin layer. Allow the extra water to drain into the tub.
Sprinkle seeds onto the paper. Use larger seeds so they add more of a decorative element. Press them into the paper with your fingertips.
Set the screen, paper side up, on top of a towel. Set a second towel on top the paper, and press down to absorb more moisture.
Leaving the towel on top of the paper, flip the screen over. Carefully lift the screen, leaving the paper on the towel. Allow it to dry over night.
When the paper is completely dry, fold it in half and decorate your card as desired. Write the planting instructions on the back of the card: plant card 1 inch deep and water.