Understanding how shapes come together to form pictures is one of the easiest and most satisfying lessons to teach younger kids. Many of my lessons involve drawing simple objects, and flowers are one of them.
The idea is to think about composition. Show the kids how drawing the centers of the flowers first gives them more control over how the final picture will look. Demonstrate how to draw large and small centers using ovals and circles. Then, show them how to add petals, make tulips, leaves, etc.
Draw as many graphic flower shapes as you can. Get their creativity spinning by showing unique flowers that have a square or triangular shape.
Now, give them a black marker and let them go.
After the flowers are drawn, it's time to connect them. By drawing one line from the side of one paper to the other side, connecting the flowers as you go, gives the piece a cohesive look. Double the line and the picture is ready to color.
You could use pencil crayons or markers for this part.