Just as I was ready to post clue #2 to the Hummingbird Treasures First Give-Away, Carrie P. from A Passion for Applique left the correct answer in the comments.
The answer: Vincent Van Gogh's Vase of Irises (also known as Still Life of Irises).
Carrie, make sure I have your e-mail address so I can contact you about personalizing and monogramming your set of four large, dinner napkins.
Another reader actually guessed Van Gogh but incorrectly identified the painting as his famous Sunflower painting.
Here is the last photo taken just before the finishing touches were added to the vase.
Hugs to you all!