I found the idea here, and bought sticks and Velcro from Amazon (see below for links).
I printed and laminated the cards, then spent a few minutes sticking Velcro on popsicle sticks. It all fits inside a zipper top Ziploc bag for storage.
Esther was so proud of her flower! She's such a puzzle whiz, I just handed her the cards and she figured out how to make things. Lucy enjoyed making some of the alphabet letters with her too.