Create paintings of flowers in a vase just like Vincent van Gogh did. Take a look at van Gogh's "Vase with Fifteen Sunflowers," (1888) and count to make sure there really are 15 flowers in the painting. Create a floral arrangement of 15 flowers in a vase and give children white drawing paper and tempera paints. Allow preschoolers to paint the flowers in the vase using small paintbrushes.
Children can string Hawaiian leis with string and precut small flowers. Before working with preschoolers, cut small flower shapes out of various construction paper colors. Punch a hole through the middle of the flower shapes and place them in a container, along with bits of cut up colorful straws. Children can use a length of string and begin threading the flowers until they have created their own multicolor flower lei.
Collect fresh flowers from outdoors and use them to create flower prints. Have children lay the flowers flat on a worktable and paint over their petals gently using tempera paint and small paintbrushes. Press the flowers onto pieces of white paper then pull them up, revealing the flower's impression. Continue painting and pressing until the children's papers are full of flowers.
Use flower seeds along with dried flowers to create a special bookmark that later can be used to grow flowers. Place dried flowers and seeds on the worktable along with glue, paintbrushes and precut rectangles of 2-inches-wide by 6-inches-long construction paper. Have children brush glue onto the construction paper and then sprinkle it with seeds and dried flowers, creating a flower bookmark. The finished bookmarks can be used and then planted in the child's garden in spring.