Flower

Flowers are a type of plant in Minecraft. While they can be planted on grass and earth blocks, flowers cannot be cultivated like trees, sugar cane, or crops. They appear to spawn in clusters randomly on grass tiles. Before this update (Alpha and Classic), flowers served no useful purpose save for decoration.

As of Beta 1.2, flowers can be collected and used to make Wool Dyes.

Yellow Flower
Yellow flowers can be collected in one hit and placed in a crafting grid to create 2 units of Dandelion Yellow dye.

Red Flower
Red flowers can be collected in one hit and placed in a crafting grid to create 2 units of Rose Red dye.