Since I was on a budget (the budget being $0), and keeping in mind a younger audience I kept my flowers simple, colorful and inexpensive to create. I just used the school's banner paper and sketched a bunch of flower petals, cut them out and taped floral wire to the back of each petal to create the 3D flowers. The flower centers are just bright colored felt glued onto paper plates and stuffed with a little batting. The flower stems are sticks. Then I just hot glued everything to the board and shaped the flowers.
Viola! Spring time at lunch time for all the students!