We dyed doilies and let them dry. We them assembled them into flower shapes and used a pipe cleaner as the stem. I bought vases from the dollar store, and we put the doily flowers in them. It really did look like a bouqet of flowers. The kids also did their own card to go along with the flowers.
We did that too but I just let the kids paint abstract on a piece of paper then when it dried I cut out flower shapes!