This is such an easy and fun project! You will need flowers, cards, glue (Elmer's or equivalent), cinder blocks or bricks, and two pieces of lightweight wood.
Spread all the flowers out evenly. I chose more than I needed for my cards in case some didn't turn out.
Press between the two pieces of wood with cinder blocks. (the heavier, the better) hint: use a paper towel under the flowers.
Find plain note cards that are sturdy.
Wait a few days and then lift up your blocks to reveal your flowers.
Mix and match or glue one of each flower to the cards.
You can even use herbs or plants. Above, broccoli flowers.
Store in a safe place until you're ready to use.