I grabbed my Tombow markers, a few Prismacolor pencils, and a water brush (think of a fountain pen with a brush tip and water in the barrel) and created a poppy after looking at one of O'Keeffe's wonderful renditions.
Just before starting this card, something on Pinterest caught my eye, kirigami flowers as shown here on Curbly. Here is the link to the free download. Scroll down for the free tulip pattern that I used on the card's interior.
I will add a sentiment along the lower edges of the white paper and get this in today's mail.